Just got a 455 engine and got these numbers off of it. Any info would be greatly apreciated. Thanks! The cylinder heads are E heads,how do they compare to other Oldsmobile cylinder heads? Would I be better off with Edelbrock heads? The engine is a F block with # 396021. The intake manifold has the # 398662 and d1s was on it as well. Should I try to find a rebuildable Rochester carb? or what would I need to put on a 600 Edelbrock?I may put this intake on my 68 442 convertible. Not in a rush to rebuild the 455 Im gonna take my time and slowly aquire the desired parts crank,conn rods,pistons etc. This 455 would eventualy go into my 68 442 convertible and I would like a pump gas friendly 400-450 horse power.

 

You'd be hard pressed to make 400 hp with anybodys' 600 cfm carb.

 

The E heads are 1970 Olds heads. Can be either large of small valve. If the engine came out of a Toro they would be large valve. Any other car and they could be big or small. But they are good heads. You need 750 or better cfm for your carb. A Edelbrock performer intake manifold would be a good choice.
You need to package everything together, cam, lifters, head work, compression, etc to reach your goals and run on pump gas.

 

As mentioned the E heads are fine for the street. 450 hp on pump gas with iron heads will need a very well matched set of parts.No speed pro pistons,medium riser dual or similar single plane intake,correct cam for compression,definite valve and port work on the heads and a very well flowing exhaust. Or dump the iron and go edelbrock heads,bump up the compression and cam accordingly and there you go.