It will be interesting to see how your car performs with the new heads, as the motor is not a million miles from mine, although your stage 6's have the raised exhaust port unlike my edelbrocks. You can be the test bed, so to speak. Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
