EBuyguy
You're going to Outer Limits territory in thinking of putting an outboard on a boat as big as Ericson 35, and spending some real money to do it. I think the description any future buyers would use for this concept is "bastardizing the boat".
If you're willing to go $4,000 to mickey mouse an outboard, you should buy a rebuilt A4 and you'll get most of it back when you sell the boat. See
http://www.moyermarine.com/forums/ar....php/f-13.html for some choices.
You might first put a few hundred into having a mechanic work it over - A4s are pretty robust.
Good luck.