I built a 360 based 417 in 1999. I used stone stock 340 J heads un-ported and un-touched. 1.88 and 1.60 valves. I used the MP 340 replacement camshaft, and even ran stock early 340 manifolds. Stock 71 340 intake with a worked over Thermoquad. In a 67 Dart GT with a 3.23 sure grip in an 8 3/4. I never got to take it to the track, but that bastid would get outta town. It had GOBS of bottom end torque RIGHT off the line and right to 6K.
