My buddy plans on running this set up, but were not sure if we will have piston to valve clearance problems. Stock crank, Ford Motorsports F303 cam, Hyperutectic pistions with dual valve reliefs. He plans on switching to the Trick Flow Twisted wedge heads with 1.92 valves, and getting 1.7 rockers. I have heard that the twisted wedge heads are the only set of heads that you can get 2.02 intake valves and keep your stock bottom end. Is this true? Thanks in advance.