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Hi again.
I hauled out the engines best I could and made some measurements.
300 Pan Drop aprox. 6.5-6.75 Square. Drop stars 1.5" rear of motor mount centerline, ends 8.5" back.

430-455 Pan drop...

My motivations are similar to yours but at heart I'm a hot rodder and I want it to smoke the tires while being a reliable driver.
Still didn't say where you are? Would make logistics for joint...

So Buick decided that was so profitable to repair they'd put two in the Riviera's, right?:clonk:

I've got a 65 2 Dr hardtop and I started down the same track. The 300 is a very small center drop oil pan and the 430 Rivieras were a center drop pan but too big to fit like 3 inches. I have a rear...

Water pump same issues as Big Blocks, guess Buick was a slow learner. Do these have same oiling issues as big blocks, bad flow, small passages, too many angles?

65 2 dr LeSabre. Had blown 300 so gave it away with idea to put in 430 which I have extra. After old motor extraction see job is not that easy.
So found a 64, 300 Alum heads, Alum 4 barrell. So...

I found out 65 LeSabre and 65 Impala have same glass. Jumped to body metal and found they re-pop center panel exterior metal at bottom of rear glass for then Chevy and I think they had trunk pans:...

Money seems to be in cars that are close to stock. Buicks aren't Chevelles so watch the $ you put in. I do think the brake upgrades are a good idea and don't think that would hurt value.:car:

520-400-8230

Guy in Australia has conversion set advertised sometimes in ROA RIVIEW for 68-69 Rivi's
I think are the same. He uses a GTO/Holden rotor re machined and caliper with a custom bracket. Pretty pricey...

Hadn't thought about exhaust manifolds. I have several; 455s from unknown source, 430s from 68 Rivi. I am building 200-4R its small and I thought it would fit easily. Tell me more about breakage! I...

Something out of balance: like a torque converter, (I've had that) mis aligned or bent flex plate(I've had that) mis aligned bell housing ,hard to screw up but possibe. Ford had trouble on the...

I happen to have a well built 430 with TA front end etc. just looks like I'd need rear sump pan & pick up & old radiator from my Rivi I hope.:wavey:

I'm running a 68 Riviera put 8.5 wide 20" dia wheels in the back and matching style 8.5x18s in the front used "1/2 offset" 5 bolt 5in center wheels designed for a 1/2 T Chevy P/U.
run 245/45 tires...

I also have dreamed about a cool EFI BB Buick motor and I wasn't trying to dis your idea.
If I can paraphrase what was in their article The current crop of after market EFI s don't use enough data...

I want to put a 430 into a 65 LeSabre. Had a 300 2 Barrel (what were they thinkin, it's 18 Ft long ?) Sort of a Wild cat clone. Any info would be appreciated. Can I fit Electra front springs? Plan...

I second all comments about efficiency, except fuel injection maybe as you'll spend $3500 or more and that could buy alot of gas.
I'm running a bored and built 430 in a 68 Rivi with 3:42 gears and a...

I'm using an 800cfm Performer with elec choke on a bored 430 with a 268 comp cam and I like it to haul my 68 Rivi. Had to run an adapter plate for the old iron manifold which adds an inch in...

I have a 68 Rivi with a built 430 & run 3:42s behind a 200-4R.
The over drive gear gives me 15 MPG hwy on trips from AZ to Seattle,
and I can easily smoke the 20's on the rear.

Depends on your time frame. I have a 300 in a 65 Le Sabre, was told it didn't run when I acquired the car. My plan was to remove and add 430.
Car is now in AZ and I'm pretty busy. It would be core...

GOT BUCKS? I just talked to American Powertrain in KY yesterday and they had T-56 magnum 6 spd rated at 1000 lbs torque with bell housing,
hyd clutch assy., clutch and flywheel avail for 455 Buick....

I'm running a 3:42 posi in a 68 Riv street/strip car behind a built 430 (out to about 440) and a Cal Performance (Art Carr) 200-4 R. Get about 15 mpg with air on and cruising about 70 mph and it will...

I have a couple of 68 difs a complete useable open 3:21 and parts for a 3:08 with posi cage.
The difs in these cars, as near as I have been able to find out were only in the 66' to 70' Rivieras, 225...

I have a whole car diagram, 68 riv I think. I can make a hard copy, but it may take some time to find.