It is a good deal--but, the carbs are going to need rebuilding--so figure that in. The trailer will probably be close to 8 K for a good float on. You might find one a little cheaper. The Honda 90 is going to be at the lower HP range--most had 115 Yamaha, which was an ideal motor. I would be skeptical of the 36 knots (Maybe 36 statute if very light).
The bigger issue, is a Spring Valley CA address/contact, and the boat is in New Jersey? That rings bells for me. Yes, they are a donation expeditor, but they have no direct contact with the boat, and only represent a charity for a fee. I would try and find the owner thru DMV in New Jersey and see what the deal on the boat is. I would certainly want to look at the boat and do some very careful hull inspection. A boat in New Jersey, which is not shrink wrapped, will be subject to snow, freeze and thaw. Any water in the core will have expansion and contraction issues. Both an ultrasound, moisture meter, and FLIR camera should be used in the mandatory survey for the person who buys this boat.