I personally think it is a great looking boat, and I would certainly like to own it. I would have to agree with most on here that it won't bring that kind of coin with broken engines. I'd say $6k/ engine to go through is a light estimate. I think anyone looking to buy a boat with broken engines should budget $10k a side because once it's open, you look at all the little stuff that needs replaced like rockers, lifters, and on and on and on. It won't be just a bottom end.
I feel for you throwing good money after bad. I have spent a fair amount of money putting new power in my Superboat and adding things here and there to really make it "mine". Unfortunately I know that not a single dime I've put in it, including fresh power, has added any resale value. It is all lost money. I'm ok with that, cause I really enjoy it. If you're worried about it from a money standpoint, you need to keep it, fix it, and drive it. I don't think you'll see even a fraction of your investment if you were to sell it now.
just my $.02 for what it's worth.