Swap or not

If you like the setup that you have in the '69, I would pull it and put it in the '74. If you do swap, then you have to consider how much the value of the setup in the '69 will add to or decrease the value of the car. I have considered buying a HDK setup myself, I just don't see where you will increase the value as much as the setup will cost, makes no difference in value if you plan on keeping the car. Good luck either way.