Help with Catalina 22 purchase! Yes or no?

[Rxwoman]

Hello all, newb here wanting to ask about some weird stuff I found on a boat in Baja CA Mexico.

For starters, there's not alot of sailboats for sale here in my price range, there's only one other I'm interested in, but its a days drive away, so this one and that one are my options currently.

This one is an '84 Catalina 22 that looks all original, and in decent shape for its age.
But here's what I found upon looking it over.

The compression post has 2 hose clamps on the top instead of the wood circle that goes there. The current owner says he bought it that way.

More concerning was the spray foam added in the bilge area. He said he thought some came that way from the factory, but I didn't think that sounded right.

Why would someone add spray foam to a boat like this, and should it concern me?

It's also missing the "saftety" railing all around, the wooden veneer in front of the keel winch and the rubber roller for the mast crutch. All things I could live without.

I'm just worried what that spray foam might be hiding. It's all the way up into the fiberglass funnel under the starboard berth that supposed to drain a portable sink.

Oh, he's asking $3500 for it, including little 3 horse motor and the trailer its sitting on.

Advice? Thank you.