1973/74 ski nautique 18 ft

Why don't you ask for the obvious..........a test drive 

But it tonight
Yes of course have him start it, non forced water is best. Pete likes to let scupper suck it up from a bucket. Pete’s method shows signs of poor water pump impeller and blocked engine block ports. Probably good idea from engine check
After that a hose is fine
Look at prop condition, not a deal breaker
But could show bent stuff
I absolutely love that boat good thing I’m not there I would gamble $5000 offer 4750
And smiles all the way home

Lake cruising and some casual skiing. What are some of the main red flags I should be looking for ?

Thanks I appreciate it. What specificity should I be checking to make sure it’s in sound condition. Especially when it comes to the engine because I’m not very experienced mechanically. For example Should I have him start it on the trailer with a water hose attached to it?

Beginner never owned a boat looking to get one and there’s a 1973/74 ski nautique available in my area they are asking 5,000. Their description-

“fully restored, new prop, Mustang v8 351 Windsor engine, New petronix ignition and coil. New tune up/ plugs. New oil change, well maintained. Runs like new, Original front seats too. Heavy duty 2 axle trailer with old style Ford moon rims and whitewalls. No rust, rot anywhere.”

In the pictures engine looks clean says it has 160 hours which I have a hard time believing for that old of a boat but ok.

I’m wondering if this is a decent deal and what to check on it to make sure it’s in good mechanical condition. I’m new to this community so I apologize for my lack of knowledge but I hope some of you can help. Thanks.