Problems at 3100 RPM sound like fuel delivery system problems. Even the small fuel valve should get you above 3100.
I have read the over 40 machining steps before, and never knew what they might be.
The earliest Q-Jets DID need a few (the 1965 probably deserved the term quadrajunk), but Rochester fixed the early issues themselves.
Jon
__________________
"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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