[ReMorton]

Priblem fixed after spending much time doing continuity checks.
Diode to VR was blown (see No 5 fuse box, slot 9 in Superformance OM). Electric choke wired to wrong side of alternator. Root cause is believed to be to the incorrect wiring of the electric choke, cascading ultimately to diode blowing out. May have also been root cause of constant 15 amp fuse issues with turnsignals/fan.
Also found some wire colors didnt match wiring diagram.
Diode replaced, choke wiring redone correctly. Ammeter now more stable when switching electrical components off and on.

Since no one has monkeyed with the electrical system, I asume this is another quality issue left over from the orignal Park Place Motors install.

Thanks all for the useful tips. Still bummed that I didnt make the Mt Baker run, although really dodged the bullet in this case, failure could have taken place on the road instead of driveway..

Work was done by 'Mike' at MC Automotive in Lynden WA. 360 318 4163. Highly recommend for us guys up here in the north side for wrenching you dont have the time do. Didnt charge an arm or a leg either.

MPS dyno now in another shop Nooksak. Will provide info if anyone is interested.