I've had my Z since new, it's a 74 260 with manual trans. I drove it for 15 years, then parked it in the garage for the next 15 yrs.( Big mistake) I've spent the past 4yrs getting it running again (lots of work) but a labor of love). Had the head rebuilt, replaced the flat top carbs with older SU's as well as several other parts way too numerous to list. Had it running good but now am experiencing intermittent electrical problem (no spark) which I believe and finally my mechanic agrees is a problem with the Transistor ignition unit. (We've already eliminated a fuel delivery problem as well as the obvious problems, ie. coil, distributer, plug wires, dist cap, wire corrosion, etc.) It's a 5 wire unit marked as E12-05. Could really use some help locating one or another way around it. I've seen on some other sites as well as my mechanic that I could replace it with a Chrysler 5 wire ECM but can't find any information on wiring it. Any help or advice would really be appreciated.