[Tim Ayers]

Do you have access to this engine or are you buying it sight unseen? If sight unseen, max $200 since it's confirmed it has a 4" crank.

If going to see it in person, bring a wire brush and brush away the carbon around all the valves. Bring a high power LED flashlight and look closely for cracks from the valves to the cylinder bores. Brush off one of the pistons to see if there is an oversized stamped into the piston dome. This will tell you whether or not it's ever been rebuilt.

If you don't see well, bring a magnifying glass. Most cracks can be seen if you know what to look for.

I would suggest tearing this block down regardless and cleaning it properly. From what I can see, there is a lot of crud in the water jackets.

Judging by the poor quality of the picts, I'm making the assumption that it will need to be rebuilt. The bores look past just a hone and re-ring, but this is a big assumption just going off the posted picts.