7ft? that sounds like a really shallow pond, lol. Im sure the Saltare will be fine in it but if it got much lower it would be rough. I never take my boat in anyhting less than 3.5 ft. I can't imagine you would get a good wake in 7ft. most of the time it needs to be about 10 ft for a nice, clean wake.
The 454 rightly tuned will get about 6GPH. It holds a 48 gallon tank. Overall, that is a great boat. Very roomy, and alot of power to do whatever you want to do.