Welcome aboard
I agree with Roger.
The transom will need to be rebuilt to fill in the old holes and make a new one for a single. This requires removing all the laminated in wood and replacing it, then a layer of fiberglass to seal it.
The stringers may need to be reworked.
You'll want to back up the new engine with a BIII for a cost of around $20K alone.
You did not mention you motive for this but if it's operating costs you will not see much savings and it will take a very long time to cover the cost.
You also did not mention the current condition of your engines, if shot re powering will be cheaper unless you are looking at 2 4.3 MPI with new drives.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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