My sons Dart is a stock stroke .030 over 400 (406). KB pistons and Eddy heads with 10.6 comp and MP .557 cam. RPM intake and a 750 DP with CPPA 2" headers. In his 72 Dart that goes 3550 with him in it. It has a 9.5 Dynamic converter and 3.91's. With Hoosier QTP 26 x 9.5 tires he has run 11.45 @ 117 best. Yea you dont always have to stroke a 400. Ron