71 GMC engine swap-arino

[Kalums]

Anyone know the "tall" Acdelco water pump part # all the websites Ive tried keep telling me it is supposed to be "short" but my current one has a 2 belt pulley and 3 on the crank.. maybe had a smog air pump at one point... Idk, thanks in advance.

Also will there be a problem in the TBI 350 with the back 2 water ports in the head being blocked by the Intake manifold? I don't see a crossover in any of the rear parts of a Carb intake (I think because of the HEI) ideas?