dolinick

right now i have 16 inch tires and wheels. only 2 of my tires might be any good though. i might have 4 that i can use for a short while. I just bought a 1979 GMC Sierra Classic C20. I love it. It has questionable body and some rust but a 350 v8 that smokes a bit and 4 speed granny manual transmisson. I need some good tires and might change the wheels if i have to. now it has aluminum wheels and i got 2 steel wheels from a later model chevy. what years fit on this 8 lug truck?