I know if you bore a 305 chevy engine out .030 and use a 3.75 crank from a 350, you'll get a 334 inch engine but still because of the small bore it's not really feasable. on my 305 I bored it out .060 and have a 3.75 crank that I can use and was wondering what size this would give me. I have to much $$$ in this engine and it runs great and with the new heads I increased the rear whel HP by 30. Just and idea I'm floating around.