454cid
Sooper Pooper
"What upper control arms are those? They look like 4wd uppers."
They're the stock controls arms, I replaced the bushings and ball joint, but they would be similar to part#'s ACDELCO 45D1248 & ACDELCO 45D1247. To the best of my knowledge they came on the C-series 1-ton and heavy 3/4 ton trucks.
Now, I feel dumb.... I forgot about those arms, and I actually have a set in my garage from a G3500 that need new bushings. I grabbed them from a prior job when one of our vans got new ones.