Poor idle and off-idle performance after distributor swap

Big shout out to Ray (halifaxhops) and AJ/FormS for taking the time to help with this issue. Thats why I come here with tech problems, even though I drive a b-body.

Current theory is that the timing issue was either caused by the intermediate shaft slop, or by an excessively loose rotor tip. Will update once I get the distributor back from Ray and fire the car back up. Definitely an unusual problem.