I can't speak for the holley carb on those but I have had a few with air leaks between the throttle & bowl castings on the motor craft carbs. Plays heck with the idle and transition circuits.
Double check the gaskets on the bowl to top & throttle castings as sometimes the passages aren't punched quite correctly. (Been bit by that one before)
Saw a comment re the check ball earlier and thought i would add that there is a brass metering weight that sits on top of the ball, the acceleration circuit will overdose early and starve late with out it. Some of the kits don't show or inc!ude it but believe me it is needed!
Have had many a 300 over the years and always liked how smooth they run.
Some of the later ones used a plastic cam gear that had a knack for becoming a drum at the most inopportune time but that was well afters yours.
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