I've got a question i have a 1985 mustang HO 5.0 it's got 175,000 miles on it but it has full race exhaust, headers, plugs and wires, shifter for a five speed transmission and its about to have 3.73 gears in it but right now its got 2.73 i live in Midland, TX we race at Penwell, TX what do you think it should run when we put the 3.73 in it what do you think it should run............. right now it runs 15.07.et in the Q- mile we think it should be running faster what do you think the problem is if there is a problem