Six Pack Throttle Plate Hole Size -- Outboards

I'm questioning what the proper size of the outboard carb's throttle plate little holes should be. I'm running a 340 in a Challenger (T/A clone for street/autocross and road course lapping), stock cam (.429.444), mild head porting, 1 3/4" Hooker headers, Promax center metering block (64 jets) and f/r plates (80 jets), adjustable rear base plate. The idle seems to be the problem and a good racing buddy looked at the hole sizes and believes they are much too large (compared to some old used ones I have aside and there is a difference) -- maybe they had been drilled larger for use on a modified racing s/block ... from my memory 35 yrs ago when I bought the setup). We can change the plates to smaller hole-size plates and believe that could solve the problem. Any help on what the original hole sizes should be? I (we) are trying to make it run/idle, etc perfect!

Thanks ahead! I'm soon going to Road America and Joliet Autobahn to be their "Pace Car" for road racing wknds.

Mopar Mitch