You didn't mention if it is a K, or C, but i've got a 65 K10 fleetside, and I went with 33x12.5x15 on new procomp 1069 wheels. Got them for a steal at JC Whitney for $1300 delivered (yes that was mounted, balanced, and came with lugs and caps.). Got pictures of them them at my truck photo page if you want to see how they fit.
