best engine to build!!!!!

what can be done to the package nine i mentioned to reach 500 hp would an rpm air gap work or afr heads......... how much money would you think that it would cost to build package from scratch sseeing that i dont have any of the parts and should i upgrade to a 727 trans
Just curious, How fresh is your current setup? Did you do the work? Are you just wanting more power or is your 318 getting tired??

If you want to do a 360, You could work with a trusted supplier and build package #9 yourself. They can price all the parts for you. If you're working with someone you trust, they can help you through it with things like making sure the Crank & Bearings match up, the Pistons & Rings match the bore. This way you can build it to your exact needs.
I think we need a bit more info as to what you really want. Your current setup sounds like a real fun street machine already.