RPM Drop From Nuetral to Gear

Good Stuff,, the watery eyes was the give-away...,,

I would hook up the PCV,, if anything, that was helping you offset the rich condition..

Then just get it to run decent, doing the basics,, fancy stuff later.

Might want to smell your OIL, and change it, - if it was flooding with a blown P/V,, then it may have emptied the bowls evertime it was shut off, down the manifold, past the rings, into the oil..

Also with contaminated oil,, the fuel vapors coming up the PCV will make it impossible to tune the carb accurately..

Just a thought

hope it helps