According to anyone i have talked to,the blue was the 330hp 383 and the orange was 335hp 383 w/ A/C,my Gc is 330hp 383 and i know for a fact its never been out of the car or repainted,it was obvious when I took it out and spoke the the guy that bought it new in 1970,It has 74k original miles.The cars body paint was stripped and the resto never completed,hence the patina on the metal,then i got it.I dont think being a GC or a Cuda would change the engine color but i could be wrong on that point