The hesitation described is a fuel delivery problem. The single plane requires more of a shot and changing the location of the arm on q-jet may help that out. Thomasmoto cured the problem with a mod to the accelerator pump. That makes sense to me.
A single plane intake doesn't have the same pulse as a dual plane. PMD engineers really designed a very good dual plane unit for our Pontiacs. Moving to a single plane typically changes things that require adjustments.
Keep in mind that with many high powered Pontiac race engines a high flow Edelbrock Victor is used to compliment the rest of the engine and higher rpm use.
When I first read the post from Bonneville Joe I thought for a moment it was similar to what I was experiencing with my 77 Corvette. It was a dog from idle to 3000 because of the single plane street dominator and converter. When a dual plane was reinstalled and the converter changed back to near stock, the car performed much better. For low rpm use a dual plane is hard to beat!
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