I have the same intake that you are running and have had it on several different engines over the years (it's currently on a 72 LT1).

First off I would strongly recommend you run a PVC on the engine. Hook it up to vacuum port on the bottom rear of the center carb.

Dist vacuum can be drawn from one of the 2 ports located below the fuel bowl on the front passenger side of the center carb. The lower should be manifold vacuum and the upper is ported vacuum (I think you'll find ported works best)

For the accessories and trans line there should be a threaded hole just in front and on the passenger side of the rear carb, screw a fitting in that hole.

For the brake booster put a 90 degree fitting in the bottom rear carb base.

Just a couple of tips on these manifolds. They were originally designed when the biggest SBC was a 327. From my experience, any around 350 or more CI is very marginal as far as using a small base 2GC Rochester carb. If performance when running on just the center carb is marginal, these manifolds can be modified with an adaptor and a little porting work to accept a large base carb which will really wake the engine up. Also run the biggest aircleaners you can find. I usually set my linkage up to tip in the end card at about 80 MPH and have found the little chrome aircleaners start to choke the engine at about 65 MPH. Good luck.