A 50 HP is fine on that boat - but the key is know (or learn) when to slow down!
I don't like using terms like 'overpowered' or 'lively' i would rather use terms like 'plenty of power there' or 'enough grunt to get out or trouble' or 'fun' - my boat rarely gets opened up fully, but thats never a bad thing, but on the flat day with nothing about it's nice to see how quick you can go!
Wayne and Crayside are friends i beleive - i have had dealings with Geoff at crayside and he seams a nice chap. I'll mention the engine to wayne and get a bit of inside info. for you.
The boat in sandwich was real heap - but only a few hundred £'s (no engine) i just spotted in on the quay side when i was working over there - no more info i'm affraid, but don't think it would be of any use to you!
We will meet in October - but if you want that gunk stuff then give me a shout... firstname.lastname@example.org
is checked daily.
Did i read somewhere this was your first boat? If its of any interest i'm a powerboat instructor so if you want a days tuition (or even a few hours - in your own boat or otherwise) then maybe we could arrange something - come october!