Well, the limited budget says a set of 360 heads will fit the pocket. The larger head window will give the car a lazy bottom end. It'll pick up once your at speed.
Porting a set of 302's is a catch 22. If you can do it, then being without money is something your not.
A good cheaper compromise is a Magnum head. The added rocker ratio will add intensicty to the cam with more lift. The smaller head chamber will keep compresion up. Use with a .040 (Or close as possible) head gasket and a dual plane intake.
Resell what doesn't fit the Magnum head set up and get what you need. Exchange brand new parts for the correct ones needed.