574, RE: Megasquirt'nSpark Extra- Board Mods for Ignition control & 420A Wiring Diagram Posted by ner947, Dec-31-69 06:00 PM
The 4G63 ignition transistor module looks like this. The part number on the heat sink is MD149768, it's a bit hard to read because I shrunk down the picture.
I picked up this one for $10 at my local junkyard, it works like it should.
It's pretty easy to lift one of these from a 4G63, it's bolted to the right side of the head only a few inches from the coilpack.
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