6cyl to 360 swap K frame ???'s

I called Schumacher and talked w/Mike. He said the Kit will work fine with the Magnum Motor!! Yippie!! He also suggested a torque strap. Do I really need it?? 425 HP Whatch think?? Thanks for all the replies!
The amount of HP doesn't help answer this question. Need to know how much torque is being produced (Torque is what gets you off the line and yanks the front end off the ground). That being said it never hurts to have one anyway (limits how much the motor can rock and jerk on the motor mounts).