Solid boat but 70’s with a 175 might be a stretch unless the boat was empty and set up perfectly. 70’s with a 200 and some set up time is possible. It should be all composite aka no wood. Stratos started that in the early 2000’s on most of the line. If the price is right and you like the boat then tell the owner you want a compression and leak down test done on the engine and a pressure test on the lower unit wouldnt be a bad idea either.