I brewed this last winter. I added two 26oz cans of Libby's Spiced Pumpkin to the steeping grains, along with the AHS pumpkin spice pack to the boil. The AHS directions state to NOT add spiced pumpkin, but I suppose that is just because they already supply the spice pack.
Anyway, that was really the first REALLY good beer I made. If you want your Pumpkin Ale to taste like liquid pumpkin pie, follow the AHS directions, but add two 26 oz cans of Libby's Spiced Pumpkin to the steeping grains.