Turbo 383 in a A-body Barracuda

ok just tour into the rear seats of the car and took all the mounting hardware out of the car including the cargo area cover panels so i could look at what i needed to do to mini tub it to tub it is very strait forward no big deal but on a fast back the way the seat is designed i would have to completely re fab the upper seat assembly and would be a pain in the butt so has anyone ever mini tubed a fast back and kept the rear seat if so how did you do the rear seat just trying to see what options there are and save myself some time thanks