If you are going RWD, the V6s are a waste. You don't have to get a P7 head motor.
You might have to talk to me later if you really want to go through with this.
__________________
'67 Dart 270 4 door '72 340(9.5:1), 727, 8-3/4", A/C, original interior, big bolt discs
'77 Aspen SE 2 door '77 318, 998,8-1/4",A/C, Cruise control car,power discs,power steering