As said, 8 lug wheels are available. I own and drive daily a '65 C20. I converted it over to front disc. It wasn't a difficult job, just don't buy the kit from CPP. You'd be better off finding a donor 73-87 C20 and using the parts off of it. One option, but nowadays is like finding a unicorn, is swapping in a rear end from a 2WD suburban that came with the 396/TH400/Dana 60. Those have 3.54 gears. Great ratio for highway cruising, but if hauling heavy loads or climbing steep grades the engine bogs down. A gear splitter overdrive would give you a 3rd/OD of about 4.42 final drive ratio. But the gear splitter is an added expense. I have seen some that buy a newer axle with the ratio they want, 3.73, 4.10, etc, and cut off the leaf spring perches, buy the rear control arm perches and weld them on. If you go that route you'll need an adjustable track/panhard bar, but you have plenty of options to keep that C20 in 3/4 ton form.
Last edited by DoubleDingo; 07/06/2020 5:23 PM.
