I have been running pro tree / 11.50 index for over 12 years now. I struggled going shallow on a .500 pro tree , I got some advice from two very well known successful bracket racers they said " Go Deep and stay Deep " I have and have been pretty successful. My car runs 10.80s I slow it down to run 11.50s via a modified Moroso throttle stop that bolts on the back carb stud and limits how far the linkage / throttle opens by turning a bolt in or out. I have tried the E.Z. plate system as well a the Willys adjustable plate and found they kill to much mph on my application. So I went back to my bolt system.. car runs 11.50 at 115 mph with a 1.59 - 1.62 60 ft ( deep ) leaving at 2,000 rpm , shallow would be 1.49-1.52. I foot brake and my r.t.s and 60 fts are just as good as my fellow competitors with two steps and trans brakes. I run a 904 and shift manually but am considering an air shifter for next season.
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