Wow! What treat to see this old post. I cannot believe it's been 3 years since I did it. I have not adjusted the carbs since I set them with the unisyn back then; I've over 6000 miles on this set up.
As said, I made the bracket out of aluminum I believe .040" since I have it for my sons oval dirt car. I took a few photos and for the most part it is held on by the rear carb studs. The rear stud is also for the ballast resistor which I choose to run with the Pertronics ll. You can see it has 2 bends 90* each and cut about 1/2 off under the coil. If you look under where the high voltage wire goes in the coil you will see a screw with a nut. That is going into the stock supplied hole that was in the manifold for the coil to stand up. It is the brace to keep the coil mount steady.
Around the edges you see, I took a hammer and with my bench vice bent over the edge on all the sides but ones going up to the carb to make it stiffer. I also thought if it was a stamped steel part they would have made that way.
I painted it silver to kind of make it blend in. The big red air filter hides mast all of it any way. Many times I've wanted the 2 small ones like are buddies at GM used but just can't do it. Rockets show some photos when your done and I hope you have as much good luck as I have had.
My UniSyn is mounted to a Holley carb cover. The adapter is plastic for a WCFB/Rochester 4GC to a larger 7-1/4" air cleaner bottom with RTV. All of it from E-Bay.
56 Vic, B'Ville 200 MPH Club Member, So Cal.