Everything fits great. I go to put the tire on in the hub is too thick for the wheels??
8 lug Chevy wheels never fit 8x6.5 Fords and many Dodges because the hub holes for the wheels are too small.
Assuming this is not a cursed metric bolt pattern which is hub centric, to use those hubs you are going to need wheels for an older Ford 8x6.5. Personally I would measure the hubs and made sure my wheel I chose had a hub hole at least .125 bigger and used acorn nuts and if an alloy wheel had steel inserts.
For a 1985 F-350
Black Rock Series 942 Type D Matte Black Wheels 942688045
Lug Nut Seat Style: Conical seat - 60 degree
Hub Centric Ring Compatible: No
Center Bore Diameter (in.): 5.15
Most older Fords have a 50/50 back spacing, how that works with your Chevy, I do not know.