DusterKid makes a very good point. You've got a 70 Challenger CONVERTIBLE 440 4spd R/T. Quite a valuable and fun car. The motor sounds like a stump puller.Don't worry about the numbers. If it's fun to drive , do it! Its too valuable of a vehicle to end up around a tree. Spend some time tuning it and enjoy it. There's probably a bunch of us on here that would love to be cruising around and shifting gears in that car .Enjoy it. It's only numbers.
Bill