I rebuilt a Motorcraft 2 bll carb for a buddy of mine from out of state, and the rebuild kit didn't have a power valve. Anyway, I had several new Holley PV's on hand so I looked up the stock motorcraft PV number, and matched it with the Holley part of the same rating [sorry I can't remember what the size was].
Anyway, the Holley, and the Ford power valves looked almost identical, [both are single stage powervalves] and there was no interference from the PV to the float.
I haven't yet talked with him, but that is the only thing I can think of off hand that was different on the carb that might cause issues. For the record, I did see somewhere where the jets are interchangable, Holley vs MC.
Anyway, the Holley, and the Ford power valves looked almost identical, [both are single stage powervalves] and there was no interference from the PV to the float.
I haven't yet talked with him, but that is the only thing I can think of off hand that was different on the carb that might cause issues. For the record, I did see somewhere where the jets are interchangable, Holley vs MC.