Convert to manual

It looks like an A-body set of pedals to me. You can look at Brewers Performance, they have pictures of all the Mopar pedal sets. Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists

The A-body assembly is pretty unique with how close together the pedal levers are to each other in the middle. Based on the brake pedal lever shape they could be '75/76, although that brake pedal seems to be tweaked a bit.

I have to agree with @j par , $200-$250 is a fairly average price point for non-internet sales. You can see that the professionally reconditioned A-body pedal assemblies go for $499 at Brewers. Heck even the reproduction conversion pedal sets start at $329. And on eBay you'll see pedals sets in similar condition listed for over $300. Like this very similar looking set... MOPAR A-BODY 4 SPEED PEDALS 1967-1976 DART VALIANT BARRACUDA | eBay