Going through this right now with a Reid case 400 in my 71 demon build. The floor will need modified for the 400 with a GV on it. they have one for a TF that will fit with "dings" in the floor pan but it has a super long tailshaft adaptor I didn't care for and I wanted a aftermarket SFI case so I didn't need to mess with shields.
They have a short 727 version of the GV that uses the short truck/MH trans output shaft. Shortens the overall length about 10" IIRC.
