Keep us posted on the engine change. I am in the midst of a similar change -- from a Universal M25XP to a new Betamarine 25. I will initially keep the present three blade fixed prop and hope that the similar transmission ratio will get us to the same speed.
I will put this into my blog after I get some pix compiled with some words assembled.
Do post up some pix when you can.
Did you convert to a four-footed mount?
Did you get the 70 amp alternator option? Which control panel did you choose?
Changing the whole exhaust system over to 2" is fun also.
Cheers,
Loren