I very much respect the performance, weight and reliability. That said, I want a family friendly transom and the sound I know and love (8 pistons, any size). I think outboards would be a little pricier too.
I considered custom SBC but I think I can Whipple a 350Magefi (takeouts etc available for 5k complete with a warranty) for the most bang for the buck, and I can run stock for a while first, then upgrade when i'm feeling spendy.
In this boat I would definately go custom twin SBC vs custom twin or any other BBC