1988 5th sputtering, shaking, popping after Lean Burn delete

Long time lurker, first time poster. The short version is that I bought a $500 1988 5th Ave on FB Marketplace, replaced the computer control and carb, and I'm having some driveability problems. Read on for the long version. Thanks in advance for reading and replying.

Brief history:
The car is a 1988 Chrysler Fifth Avenue, originally with the Holley 6280 electronic carb and electronic spark control on the 318. When I bought the car, it was running super rich, and puffing black smoke from the...

1988 5th sputtering, shaking, popping after Lean Burn delete