Spare parts single 318 turbo build

I know my car is already a 4 speed car, but it being a od a833 it has a very short 1st gear and a huge 1-2 split. Definitely not ideal for a turbo car especially with the 3.9 gear in the rear. I do remember I have a tci (yuck) built 727 and converter sitting in the back somewhere. It was pulled out of a customers 70 challenger before we scrapped it. I also saved the 3rd member out of the same car. Not sure of the gears in that. I'm wondering if they are useable, if I should convert to the 727 and higher rear gears. I'll check out what trans and gears they are tomorrow. Only real reservation I have is the trans did see a flood.