Leaking Venturi Boosters / Edelbrock Performer 1404
he already fixed the problem guys=he was running on the mains instead of idle circuit due too much blade opening/idle speed set too high.
when he lowers it down the rpm will lower too, but can be brought up to the necessary rpm by raising the initial timing to compensate...another reason why a higher than stock spec initial timing is a good thing.
heat cross overs are not the culprit for this, all factory stuff would be running like sht if it was.
fwiw -eddy carbs do have to most issues with this, btw.