So we have a small block 450 horse n\a motor going in a lightened up 72 scamp 2dr every one has told me "727 and be done with it " but research tells me a built up 904 is quicker and lighter and just as tough and i have a good core for one aswell but i recently fell into a short tail 727 out of a 73 4x4 and im hearing from a few folks they have a " violent " first gear when used for racing .....whats that mean ? Is it worth building or am i better off continuing my 904 idea?