Helped a friend with is Bahama 30, it had an Atomic 4, which came in a number of them.
Universal 2 cylinders were popular replacements
for the original Atomic 4 but would be a bit under powered for that hull
, the 3 cylinder would be a better match, I don't think you'll find any motor that would be a direct bolt in for another brand, like the previous thread said, it took a little custom work but came out with a satisfactory result.
I had a Catalina 30
with one of the two cylinder Universal years ago and found it too weak, in anything but flat water
you were not going anywhere, the 3 cylinder would be a much better match for that size/weight boat. You might also want to ask what transmission
and prop he used, it's just as important to know when re-powering.