My 74 cuda weigth,hp and 1/4 time ????

3400 sounds about right to me. With driver lets say 3570 and 400 hp if you had a good chassis, tires and gears you would be in the low 12's at around 110 mph. But that is for an all out race car. With the high gears you have and if your chassis is not 100% and tires are not hooking hard you are going to run slower. Would think you should be able to brake in to the 13's though.