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Interesting is the inlet 3/8" and the outlet 5/16" ?
No Button top, Carter X marked, 3734S dated Oct 1963. MPC indicates "use with oil pressure gauge". Found in Mannel book under 1964, makes sense. Anyone know applications? Too early for 64-1/2 Mustang with 260/289? Fairlane, Comet, Galaxie?