Ok, here are some relevant measurements -
First for the Festiva, next for the Mystery crankshaft -
Festiva:
Crank end - 3.265''
Center bearing bore (pilot OD) - 1.375''
Pilot bearing width - ~0.350''
Mystery Crank:
Crank end - 3.345''
Bushing OD - 0.822''
Flywheel center hub width - 0.525''
Centering hub OD - 1.695
And here's a pic of the new crank pattern approximately laid out on the Festiva flywheel:
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