do you already have the heads? I'd look for a set of closed chamber heads...915's or 516's. Some have the small ex valves but that won't matter much since you're running mani's. C-body hi-po's are $$$$ Headers would be nice but I don't know who makes them for c-body's. What cam are you going to run? a cheap option would be one of the Summit cams. I'd also look around for a used dual plane intake. and top it w/ a holley 750