Rear tire width requirements in relation to HP?

Have you guys ever heard of poly locks? I guess they're engine mount technology that doesn't allow for twisting n movement like a torque strap, but causes u to no longer need a torque strap... Read about it http://www.manciniracing.com/newmapopomom.html
they seem pretty sweet, AND I can incorporate them into my conversion mounts using my slant six K member changing to 383 :-)
I'm gonna get them I think!!!!