Alpha's can barely handle 330's, that why they were only available for 1 or 2 years. No way you are going to be able to beef them up. Minimum 600hp engines are needed for it. Here's a link to a interesting thread about these boats.
Alpha's and 330's, with all respect......Your way out of the ballpark. Deffinately would be a cool boat to restore though!
http://www.seriousoffshore.com/forum...ad.php?t=12330

Yes, that is a very cool thread, my boat is shown on post #30 This great heritage is the reason I want to build this boat.
Sonny says in the thread ....
"this photo is of the 38 msv hull with my celebrity deck ,which I designed and built after we stoped building the old deck style .I built 23 of these with twin 440 hp merc with trs drives. 68 mph "
Now I really dont need to be going 68 mph in a 33 year old boat, do you think 50 mph would be realistic with my 454's and some bravos ?

I would think that would be possible. Actually you could build those to 440's pretty easy. Heads, cams, intakes,carbs, roller rockers.

thanx picklejim, .
The 330 hp 454 magnum didn't have the forged crank so they can't be built up too aggressively but I will plan on doing something for sure and will find some bravos.
This is a long term project and there is no rush so thank you again for your advice.