This was on my 408 with a '69 windsor block, 10.86:1 compression, AFR 205 heads with nitrous porting option, custom cam, TFS Box R intake, 2005 Mustang mass air meter in a 4" pipe, 90mm throttle body, TKO 600, Mac 1 3/4 long tubes, pro chamber and dumps 3" all the way and it was tuned using an...