Don - Pontiac couldn't seem to decide if they wanted HIC on manual tripowers, or not. 1965 did not, 1966 did.
With a modified engine, as you have, I would probably plug it.
If you are going to use it, then adjust as suggested by the factory.
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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