burning alcohol is an easier conversion in older, carburated engines....
I'd be real iffy about E85 in the Isuzu. It requires changing seals and lines and a bunch of crap. It can be done
LP gas conversions were real popular back when too. LP is clean, cheap, American, cheap, and plentiful. I've just never seen it done on anything newer than a MGB.
Brits even ran on a type of Bar-B-Q fumes during the war. Saw one of those at Amelia Island a few years back