Might be good for $1500 - riding very low in the back. https://nashville.craigslist.org/cto/d/1978-oldsmobile-delta-88/6659591958.html
Or he cast his own block, heads, A/C compressor and intake manifold from aluminum. This thing is going to need a seeing eye dog, at night
Has a rod knock and he still wants $1,500? That's about what it would be worth WITHOUT the rod knock, and without whatever rear-end problem it has.