The main differece is the "overheat" function... The II will not burn up the ignitor like the I kit would when the key is left on for extended periods...
The Ignitor II senses current levels in the coil and adjusts the dwell to maintain
peak energy throughout the entire RPM range. Dwell angle is increased or
decreased with changing engine RPM and operating conditions. This provides
more energy at high RPM, reducing misfires while improving engine
performance.
Compared to point-type systems, develops on average 4 times more available
energy between 3000 and 5000 RPM, and 2 times more available plug voltage.
Compared to the original Ignitor, develops on average 3 times more available
energy between 3000 and 5000 RPM, and nearly doubles available plug voltage.
Higher RPM performance is improved when used with the new Flame-Thrower® II
super low resistance (0.6 ohms) 45,000 volt coil. Also compatible with other coils.
Peak current level is reached just prior to spark, so ignition energy is sustained
with less heat build-up, increasing coil and module life.
Adjusts spark timing over the entire RPM range to compensate for the inherent
electronic delay, resulting in more stable timing.
Senses engine startup and increases dwell time, providing more energy
for starting.
Senses incorrectly wired Ignitor II or a “key left on” condition and shuts down the
system, protecting the module, coil and other components from damage.
Temperature Range: -50° to 300° F.
RPM Range: 0 to 15,000 RPM.
Compatible with 12-volt negative ground systems.
Legal in all 50 states and Canada (C.A.R.B. E.O. #D-57-2).
Guaranteed for 30 months...We Stand Behind It!
I still havn't been able to get one of these in stock, they are BO'd as per my vendor.