Thanks to everyone who weighed in on this one.
Today, I went to my local auto parts store and had a look through what they
have. To my shock, they provided a set of Borg Warner
SELECT magnetic suppression spark plugs. These are the helical wound type that
is required by MSD. A quick call to their hot line
verified this. The Part Number from the box is CH7419 and only cost me $10.79.
I installed it according to their instructions and then tried to start the
engine. It puffed once and then nothing. I pulled a wire
and using a screwdriver verified there is spark (and wow what a spark... Almost
knocked me on my arse)!!!
So I pulled the plugs (MSD recommends an increased spark gap) and observed that
the cylinders were full of fuel. What the .... I
thought. Then it dawned on me that engines run better when the plugs are not
in the velocity stacks!!! What a dumb ass!!!
Oh well, when I regained my composure, I put it all together and it ran
flawlessly. THe only trouble is that when I flipped the on/off
switch it kept on running. Flipped the battery kill switch and it continued to
run. Scratching my head, I managed to kill it by
removing the alternator positive connector.
Investigation revealed that I was getting bleed through that kept the unit
energized through the ignition warning lamp. Installing a
diode in that circuit solved the problem.
Moving on to the next test, I plugged the 3000 rpm module into the unit to test
the rev limiter. I started it up and revved it all the
way to 6000 rpm with no sign of any rev limitation. This is a "Soft touch"
limiter so I don't know what to expect. Isn't it supposed
to keep the thing from revving that high? I'd certainly think so.