All Factory Best Bang??

Hey guys want to pick your brains a bit. I'm thinking of building a 2wd pulling truck (I know Not A Body) for next season. The engine has to be all cast iron: heads, intake, and block. You are allowed to run an aftermarket carb, headers, and cam. So my question is what's the best of the best BB parts to use? Not allowed hemis and max wedge stuff is too expensive. So whats the best years parts to look for? What would make the most HP/TQ? Let me know whats your opinions on this.