It's going to be very, very, VERY difficult to get a metering rod style carburetor to run well with that big of a camshaft.......without a LOT of tuning. The low vacuum signal reeks havoc on metering rods at idle, because it causes them to "bounce" which results in EXACTLY what you are experiencing. I have no doubt that's what's going on. Find a friend with a known good Holley and try it.
It should die with the idle screws in. You are bleeding through somewhere.
Vac secondary mis adjusted.
My main guess if no vac leak. Send me your serial #
The serial number is 346053. I don’t think you can adjust the secondaries at idle. It looks like they open up by the throttle linkage. But if someone who knows a thing or 2 about edelbrocks please chime in.
I did notice on that carb that at certain idle rpms you can feel the metering rods hitting the covers, but for the most part they’re sucked down when I open the covers. But I could lighter springs on it and see?
The plug wires seem to fit snug over the porcelain on the plugs. I’ve seen worse fitting ones cause no issues. And fit well on the cap
