Looks like a steal to me. I'd email them with your number, but volunteer to call them on your dime once they give you their number.
Take frank up on his offer and tell the seller you want to have someone check it out ASAP.
Not sure how you could pull off a lake test, but may want to do that as well. Although if I remember, franks responses on here seem to be technical and good. You can look that up.
You can offer the seller extra cash or full pride offer if they help with the coordination of shipping to CA, which just needs to include them helping someone load it or hook it up...
Good luck. Looks like a sweet boat in good shape.