Factory rims were around 4.5" wide so getting a tire that fits the 8" wide rim isn't going to look stock. I'm currently researching the same thing because I have OLD tires on 16" rims and recently bought a set of 15" rims off a Nissan 4x4 I'm thinking about using. A mostly stock look in the 16" size seems to be LT215/85/R16 and it looks like a lot of people run a LT235/75R15 but I'd check with a good tire shop to see if they recommend putting them on an 8" rim. If you go to
www.tirerack.com and punch in the LT235/75R15 size you can pick a tire & look at the specs then try to find something a bit wider with the same diameter. Steering is going to be hard if it is manual though.
