I am rebuilding my Cummins ISC with conversion to Bosch P7100 mechanical injection pump.....310 hp up from 260hp...New pistons/rings/ rods, cam, head, turbocharger, bearings, water and lube oil pump(s), etc. Top to bottom.
There is an ISC 8.3 rebuild video on YouTube Hyster 8.3L engine swap by a guy named bcbloc02. There are about 6 or so videos of each step. The guy rambles a bit but seems to know what he is doing.