The bowls are very similar and I think the major differences between the 2 is the pump shaft on the splined end of the A is longer than the G, the bearing caps are very different and I don't think you use a grease seal.
I'm just going by what I've seen in the past and have no experience with the A pump, sorry.
Cas is correct, The A intake is uniquley than the G , the A doesnt use a rear T' bearing seal and the pump shafts are different lengths , the A B and G bowls all look very similar externally the G is slightly different in the area surronding the impeller shroud . The A intakes have less "bevel" on the flange the mounts to the boat hull opening . The bearing caps are very different the A seals around the shaft behind the splines vs the later type which seal around the back of the D/L Tom
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