Yes, it cleaned it up and therefore I should not need to swap ZT2's.
Not sure what did the trick, changing component values or running a good ground from the bar on the rear of the cam cover to the ground point for the ZT2, or a bit of both.
76 Suzuki GT500
2011 Jaguar XKR
A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke