I have a Dart Sport that I plan to get around to building one of these days. I have a 318 out of my truck that I will likely use to make it a cruiser. The question I have is what tranny to use. I have the 727 that was with the 318 when I pulled it. They were the original engine and tranny in my 1980 truck. I also have a short tail shaft 904. Both transmissions need to be rebuilt. Should I use the short tailshaft 904 or the long tailshaft 727?

I need to know so I can sell the other to clear up some space in my garage. I want to keep the one that is best for the Dart Sport in the future.