well you never know, I was four at the time but it was from the original owner who was a traveling salesman in his fifties who got it with air and cruise so I doubt it was a hot rodded thing, factory mishap or not who knows but it's the car I grew up with. One thing to ponder those engines were different colors not just for the customers to feel like they have something special but also to make it easier for the assembly line. take 440's blue ones would have gotten a different carb, fuel pump and dist.? than the orange ones would have had. Easy color codeding for the assembly line. 383 bolt ones were probally more similar between the two except for the carb. If you are putting carbs on the line you were used to putting Holleys on the blue ones so I don't feel its a stretch for a Holley to be an acceptable carb in this case regaurdless. The car is basically in boxes right now but I do have the build sheet I'll see if I can scare it up and maybe someone can tell what the coding would mean for it weather a mistake or not could be but I know what it has as I'm far from convinced and I doubt any of this is cut and dried but restoration rules made by a select few is well........... very corvette-ish :cheers: