I have not bought the fuel system yet. I have all my original hard lines from the tank to the front of the truck. I looked at your install again.

I think I can add a return to the tank easy enough tank or filler.

1966 C-10 Step Side. 283, 4spd, 3.73 gear. 60K miles prior to restoration. 507 Paint Code. Currently in 10,000 pieces, but it's starting to go back together.
Rear Suspension is done! Wheels are done! Bed bodywork is done! New 383 and TKO 5 speed in place.