If you bought rebuild kits from a parts store, they had no power valve included. I've not found a pattern of which carbs use the .073" power valves and which use the .060" holes. I know that my car and my wife's use .073" power valves and the '64 NOS carb I have has the .070" power valve.
I can't say what results you get using the .060" power valve, but it's obvious the smaller holes would result in a leaner mixture when the valve opens than with the larger one.
If you want a larger power valve for your setup, let me know tonight, as tomorrow will be our last day at home for a month. I could still ship it tomorrow. I'll supply this at no cost to you as appreciation for the data you've supplied!
Dick
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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