From 1961 until 1980, the Scout 80, Scout 800, and Scout IIs are all 100" WB. The 80/800 are like the picture you posted. ~2" narrower than a SII, and a little shorter overall.
You might also find from 76-80 a stretched 118" WB SII.. same as a Scout II, just 18" added in the middle.
If you want to WHEEL a Scout 80 or 800 like your Toyota, then it doesn't really matter what you get, because you're going to throw away almost everything but the frame and the tub.
80/800 (the "smaller" version) never had power steering, never power brakes, never disc brakes, closed knuckle Dana 30 up front (at best), tapered Dana 44 rear (Dana 27s and flanged '44s possible, too). 80s all had a 152 4cyl, 800s had a 196-4/258-6/304V8. Vacuum wipers
Here's an example.. my wife's 1968 V8 Scout 800.
Originally eqiupped with a 266 V8, 3spd.
Now sports a Scout II 304V8, T19 4spd. Scout II grille. Electric wipers.
It's going to get Scout II Dana 44 disc brakes, and she's asking about power steering, too.
While I'm in there, it'll get some other type of leaf spring vs. stock.. so we'll be left with the 800 body and frame.. and not much else.
OTOH, find yourself a 75+ Scout II, and the options list can include:
2.62 Dana 300 (1980 only) or 2:1 Dana 20
Saginaw p/s
Power brakes
Disc Dana 44 front
flanged Dana 44 rear - 2.72 to 4.09 gears, TrashLok optional
Optional rollbar, soft-doors and door inserts
Cab-top (front seat), Terra top (a little more interior room), Traveltop (full length steel), bikini top, and full length soft-top. (Also the Traveler full length 'glass top with rear hatch, only on 118" WB)
Air Conditioning
Automatic (TF727) or stick (3spd, close 4spd, wide T19 4spd 6.32)
196-4, 258-6, 304/345V8s (392V8 easy swap)
Sliding side glass
Rear seat is a "fold n' tumble" against the back of the front seats.
IMO, a Scout II starts with some hardware a guy can work with.
Not to say you won't end up swapping in coiled & linked 60s, a BBC, and lots of body alterations.. at which point, the 800 might not be so bad.
My '77, cut fenders, 4" lift, 36" TSLs with a 345/wideT19/stock 4.09 D44s/ps/pn