Is this the only part that differentiates a stock distributor from an electronic? I found one on eBay and if all I have to do is swap it into the stock distributor, I'll take it.

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

It would be nice BUT, don't think you ever looked at an electronic distributor. Go to the library and look in the mopar section of a motors , Chilton or one of the rest of the auto repair books.

I would have looked, but I don't have the Haynes at my place

But I'll take that as a no and keep watching that NOS electronic distributor that's up too...

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

That NOS distributor looks good, I got my distributor at wrecking yard, paid $35 for all you can pack out. So got 2 or 3 plus a lot of other things.
The electronic has a control box it will have 4 or 5 wires on a plug that is held in place with a screw. Beter yet look in the articles section for ignition up grades should answer a lot of you questions before you have to ask them.
Also the advance rates are controled by 2 springs under the plate, and the total advance is controled by the length of the two slots in the plate there should be a number stamped on the plate if it is 15 the total advance is 30 degrees.
Get back to me if you have more questions.

check out Dougs page
http://www.dutra.org/doug/draft-webpage ... ibutor.htm
this should help you out