Dont know about the wood, I would assume there is in the stringers and transom. Take a look at the catalog for the 1996 models from Gradywhite.com. It tells you about the cunstruction materials used that year.
For the engine, I love yammys but , 1400hrs, :hmm not sure if its mostly low rmp or not, hard to tell without a comp readout, if it is was a hard driving engine may not have much life left. But you never know. All depends on if the prev owner took care of it. Have seen yammy with 3000+ but Just because an engine still has a pretty paint job does not mean it is good shape.
Get comp check "very important" on engine, hear it run before you buy it. Make sure they run it long enough to get hot and make sure its has a working overheat alarm, have them gound it out so you can hear it works. Last thing you want is a blown powerhead on your shakedown trip.
Survey the boat, 250$ good investment if your serious, 6500$ is a good price and your getting the seav2 hull. GL