See how long it takes to break it. My mate used to smash toploaders to pieces with a relatively tame 350 SBC (350-400hp). Had to go back to a Muncie as he got sick of changing boxes. I think he went through 3 or 4 in a 12 month period! The 4.44 Salisbury might give up before the toploader though, although the lack of traction in a tonner will help. Sounds like fun!