I appreciate it.

Now I can carry forward troubleshooting the rough idle with a little more confidence...bent choke valve on rear carb, multiple plugged-off vacuum lines (including the distributor advance lines), old and different plug wires, really rich emissions and fouled plugs. Looking forward to it, actually! It's saving grace right now is that it cold-starts better than my '01 Subaru and actually runs very smoothly at higher RPMs.
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__________________
Have:
72 W114 250
01 Subaru Outback VDC
99 Subrau Legacy GT

Woefully Sold:
93 300CE
96 Mazda Miata
2 Jeep Cherokees
A slew of water-cooled VWs & Audis

Woefully wrecked:
1981 Mazda RX-7
1976 Audi Fox
1986 Audi 4000