Your head gasket choice should be based on the type of heads and compression ratio you are using. Contact technical assistance at a parts supplier or parts manufacturer for your specific application.
They only make 1 size head gasket. It don't matter if it is 10 20 30 40 or 60 over the factory head gasket will fit with no PROBLEM.
That would be called a Chevy 307 bored .40 over.
Chevy 350 engines are bored to a 4 inch bore.
a 357 Chevy is a just a smallblock 350 Chevy bored .040 over for a total CID of 357, just as one bored .030 is a 355 Chevy. a standard rebuilt 350 is generally bored out during the rebuild process to usually 355, sometimes 357. right now i have a 357 Chevy in my 1970 chevelle
How much hp should I get out of my Chevy 350 bored .040 with six inch rods shaved block and heads. I'm running a 500 500 lift cam with 106 degrees of lobe separation
355
As much as your wallet can afford.
a 406 is a 400 bored .30 over
413
460
4.310
357