69 Ram Air lll exaust manifolds
 

I read on some prior posts that these manifolds are quite rare, anyone know the value?

you may be mixing up the RA3 for RA4, the round port 4's are far more rare than the D port 3's. value is relative but you're stuck pretty much with needing a buyer that's after a specific date code to warrant any big money. They make really nice repops you can buy brand new for $379 that also have the bigger 2-1/2 pipe openings that everyone's after now days compared to the smaller factory 2-1/4 size opening