[texnician01]

I think you are right. I work at a parts store and we list two different ones too. the only difference in them is the piston size. the non power one uses a smaller piston to help achieve higher line pressue with a smaller amount of effort. otherwise they are exactly the same.

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1969 C-10 292 I-6 4 spd in the middle of a restoration. going to get a 327 and 3.07 gears but keeping all of the original parts so I can put it back to original later on down the road.
55 chevy 4 door 150
47 Willys CJ-2A