Headers first, No tune needed for those. They will also work with better with a tune. I would do headers , order some G2 or Yukon gears I run 4.10's with an eaton posi, then look into some ported and polished heads, a beast sun shell for that tranny. Shift kit either a yank or Circle D converter with a higher stall.
Is this a Daily driver? Or a extra vehicle / Play toy?
Is this a Daily driver? Or a extra vehicle / Play toy?