1969 GTX powertrain is either 440 or hemi ,
All 1969 GTX's had bucket seats, woodgrain dash applique and doorpanel trim , Bucket seats were optional on a Roadrunner . But none of the interior woodgrain was even avail on a roadrunner
1969 GTX has a moulding that runs along the lower body line ( its 1969 GTX ONLY )
It also has recessed tail lights and a special trunk lid applique ( chrome trim ) thats very similar to the 1969 Sport satellite . Plus the grille is unique to GTX or Sport Satellite
All the sheetmetal ,,including the hood is the same between roadrunner and gtx
Yes, You can convert a GTX to a road runner,,,all you need is the grille. which I belive is avail thru either Modelhuas or Harts Parts.
Ps, A Satellite or Sport Satellite was never avail with the hood thats on a roadrunner or GTX