My '68 Hemi RR was also very rich, stock carbs but big cam (low vacuum signal), chassis dyno guy didn't tune it out although claiming he did...
Later on my racer-guru buddy changed the springs, needles & jets to what he was running in his Hemi Bee (which was more stock) and that cured it. Made more power, too.
Car had lost its separator before I bought it; I ran a Carter electric pump, 1/2" line, mech pump, regulator 6PSI, only the OEM tank vent line. No problems.