1990 OMC V6 to 1986 Mercruiser Swap

[fishtails]

Hello All,
I'm about to swap a 1990 4.3 V6 OMC Cobra (missing outdrive) with a 1986 4.3 V6 Mercruiser 205 HP Alpha (complete gimbal and motor swap). Neither boat has an outdrive, but I have a good Alpha 1 gen 1 that should work. What problems might I run into? I'm 99% sure both engines are mechanical fuel pumps. I'm not sure about anything in between the gimbal housings and motors. Also wondering if motor mounts will need changing?

 

[Scott06]

Outdrive ratio is that drive from a v6 or other engine ? Would inspect the exhaust manifold end elbow condition while u have it out replace as needed

would check the coupler bellows gumbal
bearing and u joints while you have it apart

 

[Scott Danforth]

since your bolting in a mercruiser, you need to remove all the OMC stuff.

your gen 1 driver should be a 1.84 or 1.62 ratio for the V6

 

[achris]

Do you have a serial number for your Alpha One drive?

 

[fishtails]

Outdrive is 0B563758 (I think - the number is really hard to read)
I'm not sure if its out of a v6 or v8. Bad news is I need a transom.
Any fiberglass pros in the mid-atlantic area need a project?