Not sure what the others said but here is my oppinion and a story that will get you to NOT buy one. What autozone basically does is use whatever parts they find. I hear that they dont even use all the same brand parts, etc and just THROW them together. A buddy of mine put a 350 in a truck for his friend and for some reason the truck didn't run right and had internal problems, etc. They couldn't fix it and tried replacing TONS of things. Well long story short, they found out that Autozone put TWO different heads on the thing!!! If I were you I'd find a 350 block, get machine work done and get the plain 350 Federal Mogul pistons, rings, etc and start from there. Maybe you can find a nice block with a crank and rods that dont need replacing and do it that way. For 300 bucks too you can get Vortec heads on it if wanted (600 total). IMO that is worth it and the heads are fully assembled. You can get out much cheaper that way and actually LEARN and KNOW what is in your engine. People have told me crates are cheaper, etc and some said no but I have been doing my own pricing and actually in the END building your own is cheaper and you can put better parts in it for the bottom end if wanted and come out at the same price as a crate or cheaper.