I ran mine with a 340 in my 65 Cuda with a 4 speed. I had those crhome ladder bars on it and it handled the power ok. I had little 60 series 14's, but then I tried a narrow little slick and she broke good. We couln't even push her off the track it had to be towed. Now the 65 has a 8 3/4 from a 69 Dart.