Olds Rocket 350,true duals. it was originally a diesel. Getting there.
Drop Kit
1973-87 Chevy C10 Truck 2.5" Drop Spindles
1973-87 Chevy C10 and GMC C15 Truck Front Lowered Coil Spring Set 2"
1973-87 Chevy C10 and GMC C15 Truck Rear Flip Kit, 5" drop
Wheels - Wheel Vintiques 37 Series
WVI-37-500505
WVI-37-580504
Wheel Vintiques Center Caps 1000-S - You will need a wheel spacer in the front to do it the right way, and longer lugs. I didn't want derby, I really wanted the Disc Brake Rally caps but they didn't fit over the disc brake.
Tires
235/75/15
275/60/15