Power Brake Booster for 65 Barracuda ?

IN would keep my eyes peeled on the ForSale ads hereon FABO. That's where I found the one in my picture which Booster Dewey rebuilt and did the gold dichromate. I found another booster set-up identical to the first one which I have not sent to him yet. The plan is to use the first one onmy wagon and the 2nd one on my Barracuda.

2 lines to the junction block - 1 for the front 1 for the rear since I will use a dual chamber master cylinder.

Is a vacuum check valve always used in line between the booster and the intake?