UCPA111 has the in line 6 supercharged Verado if i'm not mistaken a lot heavier than the new V8 , like 150 lb heavier.
If I was to repower my boat I would fit a 300 Merc V8, not saying my 4.2 Yam is not good, it is but I like Mercs better. I wouldn't consider Zukes , much heavier , offset shaft...