This is the engine that's now in our Sea Ray (connected to Merc hardware)---It's out of a 1984 Bayliner, had about 150 hours on it-- I paid $600 for it complete, pretty much stole it...

--to the best of my knowledge it was a stringer drive--
--notice on the lower right, is a motor driven hydraulic pump, is that what yours looks like? This one IS for the motor mounts, it's how you trim a stringer drive.
This pic is of the serial numbers on the valve cover, it's a "98" number too, so I'm about 99% sure yours is an OMC....