the 351 looks unmolested but definately used. Should be ok? 300 is too much. Just a complete guess, but that saw was probably not much over 400.00, perhaps 450.00 (real buying, not msrp) roughly 20 years ago? just a guess. Imo that's a factor.
Personally, i'd be all over that poulan. Looks real nice in pictures. Offer the 140 asked and share shipping. 160 bux, and you've got a great saw with likely some parts availability (doubtfull you'll ever need parts anyway, but a second example down the road would give you two really "cool" old saws, and a lifetime of parts to always have one. You could probably have that for less than 300). That is how I would think about it, anyway.
I'm just trying to help out OP. Not in anyway to offend, but you don't know prices here in Canada.
the maritimes, and especially Newfoundland, would be a great place to pick up a beauty of a 70cc saw, since scores of the boys came out west to run that size of saw for many, many years. Some would be wore out of course (the saws and the boys, lol) cause they were workin' saws, but many will be solid.
PS, there's absolutely nothing wrong with a 353. My Jonny 2152 is a really nice saw.
But, at this moment I'd be all over that cool little Poulan. Well, I would've been all over it 6 hours ago. That may be the second time it's been listed in the last month..? It looked familiar this morning.