Volvo Outdrive Question

My boy pulled this home. Had him talked out of it, then the PO made a deal he didn't want to refuse as it was sitting in storage miles from the owners house. Anyway, its an 1989 24.5 Sportcraft WAC with an aluminum trailer. An Erie boat. Aside from the cement like mud below the waterline and in need of bottom paint, it's in pretty good shape for what it is. He purchased without hearing it run. First run was blowing water out of the block. Replaced the freezeplug and this 5.7 runs very smooth. Shifts in and out of gear like silk. It's in need of bellows before we go any further, which we'll do ourselves. Looks like someone ran it with the outdrive in trailer position as that bellow is destroyed. I cannot find an I.D. anywhere. Though I've watched a number of bellow changing vids, I'm very unfamiliar with volvo. Can anyone tell me what outdrive this is?