In that case yes, you should be able to piece it together using much of the 67 parts (fenders and hood) and as long as you have your hood latch with the safety catch from the 68 you can use that and could change out the receiver section of the hood if needed...
All in all, it should work out fine. Sounded like you intended on swapping the full front clip with a 68 body etc... which would be noticeable to most car people is all...
Especially if you can get a good deal on the parts... anything is possible!