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If you use the Buick Engines by the Numbers and go to the page which includes 1955 here:
https://www.teambuick.com/reference/ident_engine_53-58.php

Your number (read it V 5627525) falls after the...

I agree, I don't know if I would be comfortable going lest than about 5/16" stems, but everything helps. Original valves are 3/8" stems. I looked long enough and these were readily available and...

Pictures of the car can be found here: '66 Riviera

Here is a couple more of the engine:
85378538

I am probably going to post this and someone will come up with a much better valve choice, but here was my effort.

Doing a straight eight Buick 263 head, casting number 1340827.
Using Ford 351...

That could be a nice hot rod project. It has a desirable styling.

There are no bolt in engines except the original. Any engine can be fitted and will require a compatible transmission and drive...

There are no general vacuum layouts like for wiring. Is there something specific you are looking for, maybe someone can help?

I see no reference to Stage I in my manual, however there is a reference to GS 67-71 using 6550819.
1972 does not show a specific pulley for GS, however it does exempt GS from the standard A body...

My 1979 parts book only shows two pullys, 5914745, and 6550750, but it only associates them with compressor models. It shows 3 compressors, associated with 6 cyl, superheat type and non-superheat...

You can't identify much with a casting number. Look up at Buick Identification by the numbers, it will tell you where the numbers you want for id are.

Some of it:

1939 Model 41 (Special 4-Door Touring Sedan (Trunk Back)
Style Number 1939-Series 44-Body Type 09
Body number 120918
Trim 708 Cream Leather, 700Tan Novelty Bedford Corduroy
Paint...

Here is a link to an out of print book on ebay. It is one I think anyone interested in performance should read before making choices.

Performance with Economy by David Vizard...

I would be surprised if you star wars air cleaner would fit.

With typical driving for 1000 miles a year at 15 mpg is about 67 gallons per year. If you got a 20% increase, you would save about 13...

We chose another crank, had it ground 10/10 cleaned it up and balanced it. We chose to remove a couple of oil plugs. This allowed thorough cleaning of the oil holes. The plugs were then replaced with...

Is the battery charged up? If it is, check battery terminal connections, then connections at the block and starter. If it isn't, try putting in a known good battery, then check that it is charging...

From Hollander:

Front Regulators
1941 46, 46S, 46SSE, 66, 66S
1942 46, 46S, 46SSE, 51, 66, 66S
1946-48 46, 46S, 51, 71
1949 46S

Cadillac
1939-40 61 Cpes.

That is strange, I don't see any sign of it, and I don't remember it. It is especially strange that at least two of you saw it and I can't find any trace of it. You will have to post it again.

An obviously heavier looking one from a blazer may physically fit, and you could use it. It may be a level heavier (rated as severe duty) than you may want. If you get too heavy duty, the fan will...

Like they said, disconnect the rear wiring harness at the plug and see how your problems behave. If they go away, then pull the interior.

Pictures/Attachments instructions here: https://www.teambuick.com/forums/showthread.php?27979-Inserting-Images-Attachments

When choosing your clutch, you will probably want the HD one for a/c.

I am not sure you are going to find the specifics you are asking for easily.

Most people who do such change overs start by choosing the rear end they feel will fit best width wise. The best...

Having now been made aware that the 57/58 pump has a vacuum aspect to it, I would suggest that the only reason for using it is probably a restoration where you are going to be using the vacuum...

No it does not.

They are the same gasket from 364 to 425

POR and Bill Hirsch are my preferred suppliers.

http://www.hirschauto.com/Engine-Enamels/departments/2/