71 cuda with a slant 6

When I graduated from High School I bought a '70 Challenger convertible B-5 blue the only option it had was power top! A girl that that went to USF orderd it, I was second owner it had S-6 manual 3-speed. I drove it for a while as it was. Then did like any teenager in the 80's did transplanted a big block with a 4-speed and 8 3/4 w/ 3.91's
should have left it original! Sometimes 18 yearolds know it all!