here are some answers to your questions

drives:bravo 1 drives powered by Imco 1.36:1 with low water pick-up lower units

engines bb (by weight point of view):carburated-aluminum intake man.-aluminum cylinder heads-light weight exhaust system with no water pump.

reason why I did this combination:was using the same boat with single 502 cu. :lost my interest ,my attention after some time,it became not exciting.
also some new boats with twin outboards (actually we never had a chance to try to with them)
I spend really lot of time by thinking about the twin outbord application but : the look and the sound of inboard looks really ''PRO'' and decide to do it.And I already had both of the engines.thats how its started. After installing the engines the back side of the boat became very high and we wanted to complete the look (and give a complete racy look)by making the side by side cockpit.

pictures:will collect them all untill monday but here are some photos

thanks for your ideas too much.please keep on sending .....