I think the distribution block for 71 has the proportioning valve built in. You may need to get lines for a 68 Barracuda. Not sure of the wheel base on the Demon, the 68 Barracuda lengths may be short. Or get the proportioning valve for a 71 Demon with power disc brakes when you get the lines. Routing should be the same as what you have. If you don't use the 68 barracuda proportioning valve, you can sell it. I'd be glad to buy a spare.
