Originally Posted By AndyF
The 590 cam works really well with the old cast iron heads but might not be such a good choice with something newer like Trick Flow heads. All depends on the combo. No idea on the OP's problem since I don't see enough details to even hazard a guess. Could be anything.

The .590 cam ran well in my 440 with MCH ported edelbrocks.

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