Verify Power Valve is good?

[AnthonyG]

Barner gave me a heads up 90 psi was probably too much pressure during cleaning of Holley 94 and I might have blown the PV. Was wondering how if possible to verify the PV is good or bad for sure? Thought it was PV causing rough engine but not sure now. Changed PV runs rough after warming up under load now. I didn't throw the other power valve away and was wondering how if possible to verify good or bad for sure? Also how do to tell what size the power valve is as don't see any marking and know different sizes exist for leaner or richer shot?
In the mean time to be sure it isn't anything else in the carb I have removed the top of the carb verified clean, took bottom off, pulled jets out and insured clean verified all looked good so don't think it's coming from the carb.
Thinking it was always multiple issues. Pretty sure the original debris I cleaned out of sloppily rebuilt carb helped and was one issue. Thought it might be the power valve as it still ran rough after cleaning debris. Now thinking possibly the coil. I've had them start to act that way when going bad?