318 Running Richer w/ Carb Swap

Hey All,

Finally buttoned up a lean burn delete on my 318 in a Magnum ( I know it's not an A-Body but there's more small block experience here it appears) and it appears to be running pretty rich and I'm trying to decide if it's the carb or another issue.

Imgur Link to pertinent photos:

Before the swap:
Still fired using lean burn system with the small BBD 2 Barrel
Noticed soot on wall of garage usually after the startup/high idle sequence but not when revving
Stock engine w/ 64k miles
Oil leak from valve covers down the side of the block

Details of the Swap:
OEM E58 Intake Manifold off a 300
Holley 4175? Spreadbore - Main Jet 64, Primary Nozzle/Squirter 40
HEI Module and an OEM Electronic Dizzy from my 76 Doba based on this post here Lean burn to old style ign swap?
Troubleshooting So Far:
A/F screws turned 1 out as a baseline until we track down our A/F ratio gauge
Swapped the Primary Nozzle from another Holley I had down to a 31
Double checked float height and the needle seating as I had bought the carb secondhand
Where we are confused is the amount of soot being blown out the tailpipe both at idle and revving/driving. It runs good and has great throttle response but the amount of black smoke is concerning.

Potential Trouble Areas:
Jetting wise, would a 64 be too large for a stock smog era 318?
Previous owner had done a tune-up but thought about a potential hotter plug swap as another idea.
If need be I could purchase an adapter and see what the 4160 I stole the Squirter from does
As mentioned above we need to dial in A/F and Timing due to gauge misplacement and the discovery of a broken timing light
Sorry for the wall of text, just wanted to give as much info as I could think of to kick it off.