I'm ALWAYS suspicious of any person that uses the line "My loss is your gain". It may be true, but more likely it's a dealer looking to make a quick sale. In all cases an 85 HP engine is just NOT going to cut it for that boat. I seriously doubt it will even get it up on plane. Certainly not fully loaded with people, food, ice, fuel, etc. So you have to presume that the engine will need to be replaced, not repaired.
The stripes are the same as the ones on my V20, which is a 1978, not a 1977.
As for the trailer, he does say that the one in the pics is not the one that goes with the boat, so I'll give him a "bye" on that one.... And yes, I've seen and have owned dual axle trailers with a tilt feature on them. The one I owned had a crank and a long lead screw that would raise the front of the boat trailer about a foot higher than stern of the trailer. Not terribly useful for launching, but it was pretty good when the boat was stored to help with the rain water drainage.