thanks Jim...fountain of information as always!
rmodel, i wouldnt sell it to you. I think they are a great idea for track only but they cause ackerman angle issues. The shelby ones were designed to reduce a 21:1 (or so) steering box down to 19:1. I already have 16:1 box. So the initial response is great.
I had a roller idler arm and this has worn prematurely (around 2000miles). I dont knoiw why just yet. either way, I'm gunna consign the lot to the hall of fame in my shed (along with the broken pistons, bent valves, destroyed brake parts and the infamous air cleaner bolt that my cleveland ate.)