I've accumulated a 3874876 distributor to begin converting to electronic ignition from the lean burn thats limping along now. I need a proper timing adjustment plate for it so if anyone has a line on one please let me know. I also need a pictoral of how it fits on the distributor. The one I have has a groove around the shaft where there is a seal but the seal is thinner than the grove it sits in. This makes me wonder if the plate goes there. The dizzy I have has a small plate bolted to the 7/16 bolt but it has no adjustment slot at the bolt and where it goes around the dizzy shaft it is much bigger around than the shaft. Illuminate me please.
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Yamaha Virago 750 history

Why not just swap on the distributor hold-down plate from your present Lean Burn distributor?
That's the later type, used with a hold-down fork that bolts to the block — just like V8s and most other distributor hold-downs. This fork-and-ring arrangement is more convenient than the slotted-plate type, so if you have the hold-down fork, by all means use that setup.

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