Yes, there should be a gasket between the pump and the block--it is normally included with the pump. I have taken some old stuff apart and did not find one. The possibility of a leak is too great without one for my tastes.

Whatever you do, do not use silicone as a replacement.

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Dennis
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65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.26@122.83mph