I am helping a friend who has a boat with an twin AQ110 petrol sterndrive engines.
Due to the hull arrangement, the boat is fitted with a twin Volvo extended outdrives.

Couple of questions if I may:
[1] Is it possible to still rebuild these engines (would need conversion to unleaded fuel - I suspect)
[2] If not - what is a suitable direct bolt in, 4 cylinder replacement.
[3] I think the outdrives can be reconditioned - they seem okay though. Replacement does not seem an option because they have a factory fitted 14" extensions to bring the props below the bottom of the hull.

I tried to attach a photo.