the engine uses the jackshaft plate, but tightens separately from it. 4 bolts for the engine, 2 carriage bolts at the rear of the plate for the jackshaft plate.
Set it up with all the bolts in place, but just tightened where they're not snug (you can still move the engine and plate a little)
Align the small and large chain sprockets then look at the belt pulleys. Alignment of those is taken from the engine-side pulley half. Mind you though, even those are not perfectly flat. The attached picture i took during the alignment process and the rear pulley isn't quite aligned. the straight edge should have a slight gap on either side of the pulley when aligned since the engine side pulley half has a very slight angle to it.
If your sprockets are pretty far off with the pulleys aligned, then you're going to need to remove the driven pulley from the jackshaft and add or remove spacer washers as needed.
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