There is one thing if i may suggest john,
after reading the thread, obviously i can lean more towards a fuel problem, not too much can go wrong with electronic dizzy's. You say when you put the foot down is when lolla misbehaves at her worst?
Just a suggestion, in my opinion i'd unbolt the carby from the manifold and pull the top off of it and have a look at the bottom of the fuel bowl. The secondary throat jet is positioned at the bottom of the bowl. If there were to be foreign materials sitting in the bottom of the bowl and disrupting the fuel feed to the secondary throat, this possibly could cause lolla to "chug", "cough" or "splutter" when the throttle is wide open with the engine under load. don't stress, the factory carby's are basic, if you do decide to pull the top off, just remember to check the float level as well, Also at the same time, check the idle needle as well (long barstard). Spray carby cleaner in all aspects of the carby to remove (if any) the crap. When bolted back on the engine, a good starting point (in my opinion) for the mixture screw is 3 turns out, and go from there. Also recheck timing.
Hope this can put some light on the subject for you john,
cheers phatke30!
ps. Don't forget to replace the base carby gasket when doing this!