Heads that will work with my engine for now???

From the way it looks my cam MIGHT be to big for a 1.90 valve as well with flat tops. If I have to open up my block again I'm just going to build a roller 302 instead so... instead of rebuilding my block just to put diffrent pistons I'm looking for lower end heads that will improve over my stock 79 302 heads until I build a diffrent motor or change my mind again and replace the pistons Anyway, I was thinking of useing some good 351 heads or some reworked 302 heads? What casting numbers are best in these situations?