hi guys, i'm looking at buying a used(1985-93, theese are in my $$ range) f-250 or 350 with a diesel or a 460. how reliable are the eariler diesel engines and what kind of mileage(not mpg) can i expect to get out of one? most of the ones i have run across so far are anywhere from 120K miles and up. anything i should look for when buying? i may just get a 460 powered one because i could always rebuild it myself. thanks alot guys.