I have a 75 318 in my 68 dart . It has a 904 tans. 8 1/4 3.21 rear and 2 1/4 exh. with x pipe and delta flows. My Question is . I am contemplating a cyl. head swap. The engine runs great, has a Hughes 318 Muscle car cam, hv oil pump ,cloyes dbl. row. timing set,mopar elct. ign.,revanator box,and '87 cast.# 302 swirl port heads. I would like to install either Pro Comps. Aluminum heads with roller rockers or Eng. Quests 318B heads with T & D rockers ?? Also will be installing TTI step headers. This car is my daily driver. Literally !!! Looking for 320 hp. This engine is tight and only has 68,000 Miles. Any Sugestions will be greatly appreciated !!!