The ends of the heads, if they are rounded and no mount holes, it's pre 68 I believe.
If there are accessory mount threaded holes, it's later, probably a 307, 305, 350, maybe 400.
Look at the harmonic balancer behind the crank pulley. If it's about 3/4" wide, 6" diameter. it's an early engine, 283, 327.
If it's wider, 1 1/2" or so, it's a later engine, 307, 350. If it has an offset weight area, it's a 400.
Still the engine size won't tell what pump it has, any will fit, it's the distance from the mount flange to the pulley plate that matters. That is what aligns the belts.
I don't recall any early pumps having extra heater hose connection threaded holes. If it has a hose threaded boss on top, it's a later model, probably a 307, 305, 350.
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