I would use the intake gasket set for the year of the heads. The only difference is the shape of the exhaust crossover passages between the heads and intake. What I see is a 1970 Buick 350 engine. This gasket set should work fine,
https://www.rockauto.com/en/catalog/...ket+/+set,5424
You shouldn't need to plug anything. The 72-73 intake should not have EGR or AIR injection.
I think it is very foolish to run any carburetor other than the stock Quadrajet carburetor. That will give you the best performance and gas mileage hands down. Having said that, it is very important to get the Quadrajet built for your engine. The Quadrajets were built specifically for the engine size, make, and year they were meant for. You therefore cannot just bolt on any Quadrajet and expect it to run right. The Quadrajet for your engine was 750 CFM. The Quadrajet is an on Demand secondary carburetor. It will only flow what the engine demands. While you can bolt on one of the cookie cutter carbs like the Carter AFB clones or a Holley, they will not perform as well as a good Q-jet. In addition, you cannot bolt either of the aforementioned carburetors onto a stock intake without an adapter. Both the Carter clones and Holley carburetors are squarebore carburetors, different bolt pattern. The adapter will give you possible hood clearance problems. I recommend you get a Q-jet built by someone who knows what they are doing. I highly recommend Ken at Everyday Performance.
http://www.everyday-performance.com/...oduct=11494619
For exhaust, I would run a nice 2 1/2" dual exhaust. Muffler selection is a very subjective thing, but I recommend the Walker 17749 long case mufflers. They are hard to beat IMO.
https://www.summitracing.com/parts/w...SABEgLOAfD_BwE
TA Performance sells a nice exhaust system, or you can look in the Summit or Jegs catalogs for a header back exhaust system.
http://www.taperformance.com/proddet...rod=TA%5F2007A
Larry
1970 GS455 Stage1 Race weight 4025 lbs.
TSP 470, 602 HP, 589 TQ
MT headers, Gear Vendors Overdrive
Best E.T. 11.54 Best MPH, 116.06
1998 Riviera SC3800
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