Low money 360 any ideas

Being that it's a '72 model engine, the factory heads should be 915s, which are essentially Jheads. I wouldn't waste the money on a different set of OEM iron heads. Have those heads freshened up with hardened seats and a set of 2.02" intake valves, and a home brewed gasket match wouldn't hurt. Plenty of guys have run 12s or better with massaged J/U/O/587/915 heads!