360 Bore

On the street, you have to run an oil cooler if you're 1/2 filled. And it's more than just dumping it in. Do it wrong, you get air pockets, and the block is junk (no way to get it out...). Personally, there is no reason to fill a block that is not going to be raced as it's primary use. Find a better block, or sacrifice the single digit horsepower that staying smaller on the over bore might give you. For anything to 450hp, figure .030 over and run it.