The TRW NOS part that Jerry pointed at has a bottom cover designed for a large truck with a deep oil pan. You'll need to change that with a cover designed for a smaller truck with a shallower oil pan. If you have your old one (and it's not badly worn) you can swap it onto the new pump.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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