Normally, we start with a boat that we like, then try to work out the right motor for it. Looking in the fast boat sections of the forum should show some examples of boats using a motor of similar specification, asking the question there might get a useful reply since that is where the members who are interested in fast boats gather.
As to site security - if the door was left open to spammers, the site would be over-run by them very quickly. Even with the checks, some have tried. They usually get spotted and rejected within their first day.
