Holley has one kit for all G3 and it moves the engine/trans 1-3/4" forward. That is NOT required for the 5.7. It helps on the 6.4 because of the variable intake manifold clearance with the firewall. Curtdog510 on here pocketed his firewall for clearance and retained the stock wiper system without mods. My 5.7 fits just fine with TTI stuff and why would I want to move weight forward?