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Well,there are actually lots of differences between the early and late style engines,but i'll condense it here..... The earliest engines(FSN 2815-980-7092) Had 9/16 cylinder head studs,5 ring pistons,and had metal bearings in the injection pump governer. FSN 2815-087-2273 engines had 4 ring...

Definetly a ENDT 673 Mack,I cannot tell from the pictures if it is an early or late production engine though. If it is slipping out of 5th gear,could be worn synchros,worn gears,or worn shift forks,or combination of the 3.

Your filter numbers are as follows(these are all WIX numbers,most any good parts house can cross them over) Primary fuel (on frame under the drivers side fender) (long filter housing) 33511 (short filter housing) 33080 Secondary fuel (mounted on the engine just above the injection pump) 33090...