1974 Duster I am Looking At....Need Help

A friend at work has this 1974 Duster he is passively trying to sell. He realized the fix up cost is more than he wants to put into it. He said he would like $1000 but would consider lower offers. He is a good guy and even offered up "pay me $100 a month if you want."

318 auto w/ newer Eddy 1406 Carb, MP distributor and Orange Box, headers, dual exhaust (fairly recent, factory A/C with comp, condenser, evap removed), originally Gold now painted black. Both rear quarters are shot, rear rocker to quarter transition shot, right side rocker suspect (looked to have filler ), rt frt fender crunched and slathered in filler, Lf frt fender....surprisingly unblemished:), roof good, floors looked good. Pass side A pillar to cowl joint looked like it may have damage (large amount of seam sealer and painted). Obviously not an AZ car. Trunk was locked so I didn't get a peek.

Has been sitting 1.5 years, ran when parked. Can someone give me a ballpark on what It may be worth as it sits? Decode ID plate?