79 5600 FORD TRACTOR with 233ci diesel 12,000 plus hours lots of blow by not much oil consumption if any. Hard starting and down on power. Looked around for short block 233ci few and far between but 256ci are plentiful. Will the 256 bolt up front and rear where the 233 was? Should I just do a full rebuild on the 233? I did learn the 233 does not have liners and I thought all modern diesel engines had liners but from what I am told the 233 does not.