Hello fellow hot rodders. I have a 1969 396 BBC, with a Comp Cam .550" lift , and a tunnel ram 2-600cfm intake, and a stock TH400. Can I install a 3000rpm torgue convertor, with no adverse affects, to the engine or transmission. Will this effect my ability to cruise around town at lower RPM's, or should I be okay. THx, Marty.