Since he built the engine 18 months ago, it's been in several areas. We did change the gear from the first runs. First time he ran it was on Power Tour in 2002 with a TB350, bad timing (it was detinating at around 4000 RPM), 2.?? gears in Columus OH. SInce then and on the latest runs we have added a posi unit, 4 Llink, MSD 6D, 3.43 gears, 700R4 built for me by a friend with GM for racing/street, and had that same friend check the timing that day. He still feels like the distributor isn't positioned exsacly correct (something about a few knoches off). The car improves with each run. This last time the first pass we blow out a great deal of smoke (cruisin too much) and then dropped with each run until the 13.5. Other than those things the enginee has been the same. The 60' times are at work for this lats time on the strip.