Originally Posted by Cab_Burge
The Carb Shop in Ontario ,CA makes a set of six pack carbs out of the older 500 CFM race two barrels carbs to fit a stock six pack air cleaner with all three squirters working up
I have worked on many stock six pack carbs and made them work without bogging, the key is the timing of the vacuum carbs opening and the setting the idle fuel mixture and fuel level on all three carbs so they don't bog up twocents

I don't have any bog problems, or lag problems with my factory Holley 6bbl carbs.
I had Promax go through them for peace of mind and I needed a screw hole in the accelerator pump diaphragm "clam shell" fixed. I had them use the correct Holley rebuild kit parts, and had them install the jetable plates and metering block, and the angled idle mixture screws equipped base plate in the rear carb, and "pretune" them on their dyno mule.
They ran good before I sent them in, but for my one man business schedule and the parts and repair I needed done, it made sense for me to let them do the work.
I will contact The Carb Shop and talk to them about that setup. Thanks.