The best spot in the motor to gain some power BowTie is with a fresh pair of heads. While you have them apart I would recommend that you have a valve job done, look into buying some new valves. Get new springs for sure, the stock ones are junk. Crane cams makes the energizer series of roller rockers. They are good, affordable as well. Make sure to specify pedestal mount rockers. There is one excellent book out there that goes over porting stock heads. It's titled Mustang Performance Handbook by Mathis I think. I can scan the stuff for you when I have time if you like.
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