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sure on the fuel mixture/progression circuit? are you using a wideband? vac leaks at manifolds? I have no experience with webers on a flat six engine, but have dealt with some similar problems with DCOE's. usually found a vac leak. even a small nick or damage to a gasket can cause problems with causing the engine to come down slowly. I even had to have a manifold decked back to true. awful. .....or that the idle jetting/tuning was incorrect.
The engine did not exhibit this behavior before the change in the ignition system? what other changes besides the ignition occurred? always hard to chase and diagnose when so many variables changed.
I'm just an amateur, but thats some of the stuff I've dealt with. good luck...
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