I don't mean to be negative, but a few years ago, there was a forum member with a similar problem, and he sold his unit.  I acquired the set-up, and upon tear down, the manifold had a huge dirt dauber clod in one of the ports.  It was fuel washed and slick, so it had been run with the mud in the manifold.  It was nearly blocking one port, so there was no doubt that it affected the idle and running of the engine.  I ported the manifold, pressure washed it, and have run both the 94s and Strombergs on it with great success.  Also, one of the adjusting needles had been run in tight, and backed out, breaking off the tip and making that idle circuit inoperative.  I know this was supposed to be rebuilt carbs and built by an expert, but there are always little things that bite when you least expect it.  BTDT.  Joe-JDC

JDC

The last Pertronix that failed on me would not allow me to accelerate but would run just fine idling. I kept thinking it was the accelerator pump in the carb. That was a Pertronix II

SE Wis

I to have been down this road. After spending $900.00 at Vintage Speed for carbs, $400.00 for Eldbrock 553 3X2 intake, and $ 125.00 progressive linkage countless hours tuning I just said the heck with it. I'm running a Holley Quick Fuel-SL-450 VS Slayer. Runs like a Stripped Ape. The flash under the hood is not worth the trouble.

56 VIC  Gene Stoehr Sr.

I have not blocked the carbs back off to run on the center carb since getting them back from Vintage Speed. I just wanted to say I appreciate everyone's help with trying to get this diagnosed. I wish you guys weren't so far away. I'm in the process of removing this intake to sell it. The vehicle will make more power with the 4 barrel. The cool factor of the 3x2 doesn't outweigh the amount of hassle this has become. Thank you all for your time.

Are you sure the end carbs are getting fuel and/or the float levels are high enough?  This is potentially just one of the end carbs acting up.

Another option is to block the end carb pads and try each of the end carbs individually as a center carb.  This might help to isolate a carb that is not doing its job and can be addressed accordingly.

Lorena, Texas (South of Waco)

I am using the pertronix ignition. I've read that when the pertronix fails, that it is just completely inop though. I had this distributor in my last 292 2bbl and I didn't have any trouble out of it. It ran ok on this new engine with the outer carbs blocked off as well. Not to say that it couldn't have malfunctioned between then and now though.

Are you by chance using a Pertronix ignition in that distributor. They can give you these kind of problems

SE Wis

I have the later style distributor. I believe it's a 1960. Outer carbs have plugs in them. No power valves.

What distributor are you running?  In an early post with a picture of your engine, the distributor is not visible, but the firewall  is '55 or '56.  Are you running a '55 or '56 all vacuum advance distributor.  In your last post, you wondered  if the secondaries are coming in  too late.  How soon do the open.  Maybe they come open to soon and do not have enough air flow  to start the fuel flow.  Do you have accelerator  pumps in the end carbs?

John - "The Hoosier Hurricane"

Well. I've swapped for rubber hoses. Added the spacers. Adjusted jets to 59P and 67S. Adjusted timing to 12⁰ btdc. Intake temperatures are about 170 ⁰ across all three carbs. Adjusted idle and mixture screws. Same symptoms. The only other thing I can think of is maybe the secondary carbs collar is set too far back, so I'm not activating them when I need to. I don't really know what else to do.