1Moses1 is correct , the length of the boat provided it is the standard 8 foot beam will have no bearing on how tight the fit is side to side . The determining factor is length and room in front of the engines . And all are different
RG.

You could go merc 600/XR package add whipple tunes (700hp) swap xr uppers for SCX and and have a perfectly reliable set up. adds about 15k when you consider the sale of your new xr uppers. Thats probably the cheapest none custom power option. (although the power is now some what custom.) But I would still vote custom power/arneson. or second choice would be Ilmor/Indy. But then you also have to consider the extra 5-10k for props. (Arneson/Indy/#6,etc)

Professor_speed props shouldn't be an issue . When I was running SSM #3's I bought a set of Arneson adaptors which alloes you to run any # 6 style prop on a # 3or 4 drive or an arneson drive .
RG.

Thanks Again guys, I'm getting an education here.

I hadn't considered that the depth had as much if not more impact on engine fit than beam, although now that I think about it, it makes sense.

I like the idea of Arneson, provided they have manners similar to an outdrive as far as maneuvering around the marina. I'm not sure why they wouldn't but know less than nothing about them. My other concern re. Arneson drives is accessibility into the boat. I'm guessing diving off the back would not only be a "no" but a "hell, no". Can you stand on them like an outdrive to get back in the boat? Sorry for my ignorance, I've been around boats all my life but have no experience with a surface drive.

Unless something weird happens, we're leaning heavily toward a 32 Schiada. I have a 24 now & will admit I'm a member of their "cult".
Fit, finish, rigging, etc all has to be seen to be believed.

This is our boat in this video: https://www.youtube.com/watch?v=pk-NCFba6nI
The only thing I'd change would be more fuel capacity; when the blowers start singing it's like flushing a toilet.

If their 43 was trailerable I'd seriously consider that hull. I've been in their factory 43 and it's amazing (and for sale), but it has 114' beam and that's a big, big boat. I'm guessing you're seriously limited to where you can slip a boat that big and we want to be able to travel and do the "tourist thing".

Cheers

[ATTACH=CONFIG]535545[/ATTACH]

Lots of room for any power in a full staggered 35. 600/700sci with NXT SSM6 package is super fun to drive and very reliable in this size hull. Proven and desirable for resale as well.

Newer Arnesons/Indy run the same props as #6 drives but they cost a lot more that bravo props was my point.

Just for clarity. We have a propeller guard for the Arnesons which prevents one from landing upon a propeller if one was to fall into the water above the drives.

Me personally, I would not want to fall onto any drive units nor any propeller as there's many threads of people injuring themselves on bravo ad well as outboard propellers.

Cleaved propellers are cleaver propellers and if/when someone wad to fall upon one it doesn't know what it's bolted onto and the injury is the same.

This is our boat in this video: https://www.youtube.com/watch?v=pk-NCFba6nI
The only thing I'd change would be more fuel capacity; when the blowers start singing it's like flushing a toilet.

WOW seriously every square inch of your boat is BEAUTIFUL! Can't wait to see your new one and run with you this summer!

My last boat had ImcoSCX/SCX with Imco transom assemblies not the weaker merc transoms. 1070 hp and 40 pitch speeedmaster props. No issues these drives will handle 700 hp with ease. They are much less hydrodynamic unless the boat is rigged with a high propeller height. I.E. Surfacing. IMO the Arnesons are a great option but market is much smaller on resale as it is with custom engines. Mercurry equals much easier resale which may or may not make any difference to you.

XPower drives are also an option