Thinking of trying to stuff a 3-71 in a 1958 GMC, LCF. Have the engine on a stand , runs pretty good, but want to change out the injectors before installing it in the truck. going to bump the RPM to around 2350 or 2450. For the transmission I have is a Eaton-Fuller 7 speed. Rear gears have been changed to 4:11. I do have a 3 speed Brown-Lipe on hand. Rather not use it, but will if I need more gears. I do have access to a frame of a 1979 GMC with 2 speed rears, ratio unknown. Any opinions/comments to my project? will it work? Any suggestions are appreciated