Most all of the aero engines work well on the airboats, the main thing is to get the engine needles set. The aero engines are designed to be reliable, where the buggy and other engines are designed for high rpm's and higher horse power. If your planning to set it up as a pusher, look for the engines with the larger cooling fins and the BB engines have a better life span, with running under harder loads.
[link=http://cajungatorairboats.com/v-web/bulletin/bb/viewforum.php?f=9&sid=b64cef672fb7c53814c77fd9d679 3689]R/C Tips[/link] check out the carb 101, it is a very good way to set your needles.