I had similar set up in my 73 nova except mine was bored over .060.
305 magnum hydralic cam, 750 double pumper, team g, flat tops.
Ran 7.00's w/ 1.54 short times all day long I knew there was more there but I was short shifting @ 5200 rpm to make the motor last, 3 speed T400, 488 rear cogs, and 9 inch 4500 converter.
Sounds like you have a 2 speed with that much gear.
Whats the ad number? Might be interested.
Hook a brother up... ><Cp