Help Gathering Info on Inherited Motor

George Jets said
From my read on your specs looks like .030 over bore. Stock bore is 4.32 your's is 4.35 putting it at .030 over bore.

Stroke looks stock at 3.750
View attachment 1715571391

Depending on what year 440 it was, 10.5:1 was normal stock. Looks like you have some high dome pistons there raising the compression ratio somewhere around 11.5:1 maybe more like 12:1

You can lower the compression by putting the thicker aftermarket head gaskets in it. Let's say stock head gaskets are .035 ths compressed, you can put .085 ths head gaskets in giving you a difference of .050 ths, reducing compression ratio and increasing chamber volume.

You have pretty good lift on that performance camshaft too .590 /590 as compared to 1970 stock 440 cam of .450/.458 lift.

Stock 440 cam lift:
View attachment 1715571390

Some of the engine specialists will probably chine in here to give you more info on what you have there.

Thanks for reaching out! The guy from the shop that built it called it a "hot" cam. He said my dad was going for a mild track motor / one that would scoot down the track, but nothing that would run 9's either. He quoted it as having right at 600hp. Man, if that's true and I could stay anywhere near that and get it to pump gas, I'd be in heaven, haha! I think the cam's RPM range is going to be way too high for street driving though.