Kenth is right about fuel pressure--it needs to be less than 6 psi. Too much pressure that would force fuel past the needle/seat would explain the varying ratio, also.
Kenth's point about the size of the inlet valves (needle/seat) is likely correct, but not pertinent to Hurst65's problem. It's true that larger seats tolerate less fuel pressure, but anything up to 6 psi, in my experience is not a problem. 95% of the running Tripowers today have all three carbs with the same size inlet valves, including my own, with no issues.
Regarding the correct PCV valve--What would be the "correct" PCV valve for an engine with this cam and other mods? With the reduced vacuum produced by the Crower 60423 cam, the stock PCV valve would not be opening as much as "normal." Is it possible that the PCV valve is the reason for the varying fuel/air ratio because it is not operating consistently due to lower vacuum? I doubt it, but it's a possibility.
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'64 GTO Tripower Hardtop (Wife's Car)
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