Oh, I forgot to mention, manifold vacuum measured 12-13", so I think I'm good with the power valve. hpmike also mentioned that he'd probably install the heavier (brown) diaphragm springs. I believe the yellow springs came with the carb. I told him that when I go to WOT, the motor momentarily hesitates, then takes off. He says that there should be a smooth transition, hence the heavier springs.