Any chance you can send me a few pics of your hindle header and measure the collector tubing diameter? Those things are pretty hard to come by, so i'm wanting build a tri-Y merge collector similar to what hindle uses but not sure what size tubing to look for.
Saw your post about king of the street class, if your interested in a 954 motor swap I have 2 of them. As for the tether, either you can order one or make one used a fuse loop from Canadian tire and a tether cord from a dollar store. It'll cost less than $10 and take about half an hour.