According to the wallace calc, your present speed suggest a 9.51 with a quicker 60 ft. Based on 875 hp and 2800#, you should be running high 8,50's at nearly 160 mph.
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