That's awesome Mick53! I did run a similar set up on dual fours on a tunnel ram way back in the early 90's. I love that kind of set up. I'll probably turn this one to face the front and get out of my own way.
This is my first time dealing with duel quads and a 6-71. When I bought the linkage it was a name brand and came with no instructions except a terrible picture and a parts list. I couldn't find any other brands assembly instructions either. I guess they think if you are buying it you know how to put it together. That was the case with me once I got it figured out it all made sense. When I bent my 16 nitrous lines I had never done it before. One bend at a time and then they were done. Sometimes you just have to jump in.