strange... well from wat you describe it would seem
that the gun is not recieving enough current to make
it light up, the gun works on other cars so its not
the gun. and once you rev it it works...
so its got to be your setup. i am running a
elec dizzy and a normal coil too and no probs.
you have a weak spark from something... alternator,
bad connection, short jumping, bad spark wire,
i think its been mentioned to check the spark by holding
the plug against the block so it sparks and see what
it looks like. and go from there,
at least without having a conventional dizzy, you
can eliminate points.