68 383 with 750 carb. Runs rich

Please don’t pick on fan shroud setup (came with the car)That’s ugly and scary, better than nothing I suppose but the fan blades are exposed when using timing light. I plan to ditch that whole set up for another quality aluminum radiator with electric fans during the winter.
Also note I have no idea on the condition of this motor. I’m pretty sure it’s just a used motor he bought from somebody and threw into the car (although I was told it was rebuilt I have my doubts now). I’m just trying to get it sorted out for now so we can drive it. My son and I have not driven this car more than 200 miles since owning it. We plan another 383 or 400 combo in it.