Scott,

With the discount that you have available to you the 80 twin might be the way to go. I would investigate if it will fit in the cowl without having to split it. It may also have issues with clearance for the plugs in standard configuration. I know it can be adapted for miniature spark plugs though. I have no doubt it will pass the sound check with decent prop and muffler combo.

The ZDZ 80 is a winner if you can get one. It is a no brainer installation that will jerk that thing around with style. I would work on trying to pry one out of a clubmates hands that isn't using his.