Usually people that install V-8's with auto transmissions in TF trucks remove the rear crossmember and replace them with the aftermarket set up's. There should be lots of them around. Post an add in the swap meet and you should get some responses.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine