67-69 barracuda front clip on 74 dodge dart

In my opinion, the answer is yes. But it depends on how good you are at major body work. You can get a 66 Mustang front end on your 74 Dart if you are good enough, but you will be doing a LOT of cutting, fabricating, welding and grinding. Will the Barracuda fenders bolt on? Probably, but they may not match the cowl, and like @72bluNblu said, the fenders will definitely not match the doors. You will be forced to do some massaging somewhere. If your metal working skills are good, give it a go. Take lots of pictures. We will want to see. Although I have never tried this, I doubt it will be a simple 'bolt things on and get a great fit' scenario.