Cool deal that the owner actually reached out to you, trying to give the car a good home. Check for subframe rustout in the usual places like where the front subframe joins the body subframe.
The Iron Duke is not a bad engine, it was just saddled with the worst emissions-limiting crap like a tiny carb and a smog pump. If the car is pretty clean, you could look into swapping the throttle body fuel injection setup from another GM application that shared that engine. A final bonus, the 4 cylinder Eagles came with lower axle gear ratios(numerically higher) than the 6 cyl cars, so the car already has 3.55 gears, making it a hot rod if you were to swap in a 6cyl or V8. If the car is pretty rough, you might consider it just for the gearing. Save every 4cyl front axle you can come across, since a 4 cyl front axle swap is pretty much the only way to get lower gears into the front end of an Eagle.
Hey, blondedriver, I'm finally getting back to putting your gold car back together. I'll have to start a new projuct thread, since my old thread disappeared when the new look came to the Nest. Good to see you're still around here.