You’ll need to look at the piston & rings through the exh port (pull the muffler cover) to see if it’s in “good” shape.
The outside of the saw looks good.
Those were made in the last half of the 70s, would suggest you buy it if the piston is clean & the price is right. You’ll be impressed with the torque, if the saw is healthy.
You’ll also get more responses if you move this thread to the Poulan Stickies forum.