What is a Chevy 350 bored 80 over called?

A 350 Chevy bored 80 over would be a 364 cubic inch V8. Here's a simple formula to figure the displacement of a V8 engine: Multiply bore X bore X stroke X 6.285 and you can figure out the displacement of any V8 engine based on what the bore and stroke is. Now, before you bore a block that far over, make sure the block can safely handle that much of an overbore. An extra 5 or 10 cubic inches isn't going to make enough of a difference to justify making the cylinder walls too thin.