If it truly is 1 of 1000, keep it original IF there's a market for it. Often "rare" does not equate to "desirable" or "valuable".
Otherwise- if I understood you correctly that the fenders are Al(!!), that would make a killer FX-style replica-racer or gasser-style car. Cobalt 327 i researched it and talked to my neighbor who is a mopar man hemi guru, its all good . yes the car would be nice on the street , plus i like matts idea of putting a turbo on it .