My preference for old square bodies is 16 x 8 with 4.25 back spacing. Go no wider than 8.5”. 10’s are way too wide.
I've ran several different tires and wheels on the truck over the past 18 years. Here are some pics of how each looked to give you an idea
These are 315's on 16 x 8.5 wide on 4.25 back spacing. 4.25 is the most common back spacing for 8” to 8.5” wide 8 luggers. These wheels are inexpensive too! Desert Rat Off-Road….$115 a piece on clearance right now! The only problem with these is they are just wide enough to take bites out of the fender flares at full flex. The 8”s didn’t do that.
These are 315's on 16 x 8 with 4.25 back spacing
These are 34.5" on 16 x 7. Don’t remember the exact back spacing.
These are 33" on 15 x 8, but I don’t remember the actual back spacing. The only reason I ran these was my dad had a set of slow selling Kelly Springfield AWR’s (worthless tire!!) in stock at our shop that I got for cheap then found the wheels for $25 a piece a Western Auto on clearance back when they were still around. I needed some fresh meats because I was moving out of state where I ran these from 1996 to 2001 when I lived in Detroit, MI. Didn’t matter that they were ugly as the truck just sat under the car port pretty much the entire time I lived there anyway. When we moved back to CO in 2001 I moved to the Super Swampers on 7" wheels in the pic above. Like Dango said, the rear was no problem but the front calipers needed some massaging.