For a reference point, I took my 69 RT out today with a tired, poorly running, bogging 77 trooper 440 with the stock truck converter and 3.23 sure grip, 27ish inch tall tires (gear killer) and 9.5 inches of rubber to the ground on each side. From a dead stop warm I can stump it and it will leave 2 black marks for an easy 2 car lengths and roll smoke of the tires, if I flex up against the convertor and cut it lose I can pretty much make them go up in smoke. I say all this to point out that even if your compression is junk a reasonably tuned 440 much less a fresh one should have plenty of torque to break the tires loose. I think you are dealing with more than just low compression, cause I know mine is nowhere near 8:1.