the 91-92 LT250Rs are awesome, they have the factory gusseted frames, better swinger and rear shock setups.
the only major problems with 87-92 LT250R engines are that they need the exhaust bridge reliefed or they expand and kill pistons(only needs very little removed). and you also need to install billet piston thrust washers. that are cheap
and LT250Rs are not "junk" by any means. looking at that 91 in DEL, dakota? i was considering contacting that seller. it'll be much faster than a blaster, you'll like it