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A #7.5 power valve is the preferred one in today's rebuilt kits, IIRC.
Depending if you are at sea level or elevated altitude, this might be the right one for you - or not.
Note: modern power valves have a shoulder which has to be machined away for correct seating.
Do you run multiple carbs? You need to go lower in value, then.
best is, you contact CharlieNY.