His name escapes me but the guy on here who dyno'd the purple shafts against other cams and the similar size hughes cam made over 20 hp more than the .590.
My car is similar setup and weight to yours but my heads are ported by MCH and i reckon as it is, it would do a 10.0? with the 950 hp holley.
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