Made the swap to electronic ignition and the car barely runs now

Which timing mark were you using? The white or the green?

Just started reading this.... the balancer slipping would be the right suggestion and you found it. Explains why the chop came back.... your 10 BTDC is actually, what.... 50 BTDC? 30 ATDC? And it explains the hard cranking.

So tell us a bit more about this engine, so folks can give you better info on where to time this. Is it a stock 360 or what?