[67_C-30]

You need bigger studs (9/16" or 14mm) to run the newer wheels. You can buy studs for a '71 - '72 since they stepped up to 9/16" in those years. You can just bolt them on, but I wouldn't due to the weight of a loaded ramp truck. To my knowledge the 3/4 spindles are the same, but I haven't actually tried that. I know You can change out spindles with any year from '71 - '87 C-30 on your truck. You will have to use 71-72 ball joints and tierods, but you can use your control arms. Another alternative is swapping out the the compate crossmember from a '71 - '87.

NOW - Let's see some pics of that bad boy! Of all the musclecars and old trucks I have, I get asked to sell my ramp truck more than any of them.
Here's mine.