Quote: Would like to be around 650 horse. Next engine will be a 500 incher.
650 hp can be done with ported Edelbrock heads if that is as far as you want to go. If you want to step the engine up in the future then a set of Indy EZ heads would be a better strategy. The EZ heads are good up to 800+ hp which is then where you need an aftermarket block.
Read the book, I covered this topic in there in a lot more depth.
