In the interest of stimulating feedback to ultimately help point you to an answer, I will reshare my thoughts on the forum. It is a fuel issue IMO. Maybe a signal issue at low-speed (gasket) not allowing a rich 'storm' in the plenum to compensate for the inherent lean condition with edelbrocks at the hit. What running/warm-up sequence preceded the 1.29 60ft? OR...erratic fuel pressure at low demands (assuming nothing got overlooked during recent carb inspection) Again although the edelbrocks are not going to be as fast or quick as a holley IT SURE RAN BETTER and more consistent before so, something changed. This is where having data that looked at trans rpm and fuel pressure coordinated with dual a/f widebands would help.
