Nice Score – now you have some decisions to make…
It looks like you are opening two long running discussions; single vs. twins and I/O vs. OB. More opinions on both than you can believe.
You probably know all this but I will throw it out anyways:
The twin I/O motor box was designed around the 165HP/250cid I-6 motors. It is about 6-8” wider than the single V8 (small block) motor box. Twin I4 470s (170HP) or 490s (190HP) would be nice but are harder to find and some of them had ‘issues’. There is enough room there to put a BBC in but you probably don’t have the width to run twin V-6s or V-4s unless you stagger the motors – it may be worth checking though. If you go to a single I/O you can make the box narrower to get more room on the deck. Blue Heron did a really nice job with making the box narrower on his 25 – look at his rebuild thread if you go that direction. Deck/box mods mean fiberglass work and quickly lead to the concept of going to a bracket. Those Alpha gimbals are probably worth a few hundred bucks if you are pulling and selling them. EBay usually has several on it for comparisons. The 23 works well with a bracket unless you put too much weight back there; twin 600# 4S would probably make you unhappy. Twin 2S on a bracket is sweet nice and gives you a backup but two motors cost more than 1. A single big 4S is awesome.
Good Luck and have fun.
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