[Stewart Way]

You can run the car in modified, A is 7.5 X CID. Bob Marshall runs an older Dodge in Modified sometimes. It opens the scoop/intake to other choices as well as alum Mopar heads.
Think the single 4 race hemi is a post only in the Dodge but a post or hardtop in the Plymouth. Strange.
As far as the hoodscoop in GT , I was told by Bruce Bachelder that a scoop can't be added to a car, it had to be available with one so since your 65 hardtop was not available with a scoop you can't run a scoop in GT. A 383 shaker can use the scoop in the 68 Cuda and Dart but not the Valiant. Thats the last I heard.