Car is rough and worth $500 at most. "Running when parked" is a classic "what the hell does that mean?" comment. When was it parked? Last week, or 20 years ago? Most cars were running when last parked, unless it's one that was drawn by horses.
These days the mags might push the value up to $550. But value is severely limited what with the torn upholstery, cracked dash, no AC, NO TITLE !!, no radio (removed, I assume, has non-factory holes for speakers), rust (hopefully surface). All these will cost $$ to fix. Can't see anything near $1350. By the way, this has a 4 speed, not 3-speed manual trans. Pintos didn't offer 3 speeds manuals.
When I see an ad that says "ran when parked" that tells me that the engine was functioning, common sense tells me it may be seized from sitting or it may not. I would rather see "ran when parked" then nothing.