My 63 valiant has a 71 duster 225 engine rebuilt to stock with the one barrell 1920 holley carb. Thinking about putting some money in head work with offenhauser 2 x 1 intake, clifford shorty headers, and doing a recurve on myy distrib. I guess my real questionwould be what kind of head work do I need to have done about what would it cost

bigger valves, better springs, shave head to raise compression,porting work