From what I can tell from your pictures the car doesn't look to bad........actually it's more complete than mine was and I paid $18K in '97 (but my motor was fresh and ran).
I would suggest that you verify the engine by casting numbers and visual inspection that in fact it is a 427 S/O(
oil gallery on drivers side of block = S/O) . At this point since the engine doesn't turn over no telling what condition the engine is in. In the end best (necessary) to pull the engine and check it out.
So what does the seller have to say about the condition of the car? Why has it been sitting 8 years?
good luck,
Mike