It's a 74 Barracuda, not a 71 Hemi Cuda rag. Not like you're flushing 25k down the drain by changing the color or something. I say build it like you want it and tough to people who don't like it.

My satellite's changed from the original triple white, 318 bench seat combo to red with rr stripe with a 440. Somehow I think the value only went up by doing those changes, but again, it's no 100k car here. 74 Barracuda is on the lower end of the E body scale, I would worry too much about it, if need be it can always be changed later. IMO no sense in doing something in a color combo you won't enjoy. But then I don't build cars to sell, I build them for me.