no, the 55/56 only came with a gasser.
there have been a few diesel swaps into the 55, it isn't a bolt in, frame widths are different, firewall location is different, exhaust routing is different, driveshafts need mods, shifters are different.
IF you are considering a diesel swap then go with the 1HZ manual swap. the older 3B/2H engines are getting harder and harder to find parts for.
just a suggestion