Mercruiser 470 - Engine Removal and Flywheel Bolts Replaced

1981 Mercruiser 485 with an SEI 106 in a Wellcraft 196 Bow Rider
Mercruiser 470 and 485 are nearly identical except for camshafts.
The sterndrive failed last year and I bought a remanufactured Alpha One Gen 1 sterndrive from SEI to replace the original. We thought our problems were done until......