The ser. no. Starts with the displacement , I. e., 228xxxx. Seems like military front mounts are different, however, center bottom, front mount could be used, or make your own front side mounts. Your bellhousing is probably too small for a, 11" clutch, might need to get a later bellhousing, or get an adapter plate to use a modern bellhousing. Your existing flywheel is probably 4 bolt, 302's have 6 bolt flywheels, so use the 302 flywheel. Chevy flywheels can also be redrilled to the 302 pattern. Military 302 oil pans are extra deep, OK to use unless too high. Only 270 and 302 oil pans work on 302's, longer stroke requires sides of pan to be wider.

Makes your truck more useful. Easy swap to do if not in a hurry.

Ed

Last edited by EdPruss; 01/11/2019 5:49 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.