I set the front end about 4" forward to extend the wheelbase for more stability at high speeds and a smoother, more predictable launch. Also by moving the front forward it allows more weight to be on the rear. Same result as an engine set back.
Furthermore the police interceptor model front end has very stiff factory springs. Entire weight of truck less the engine and transmission compressed springs ~1/2". Hopefully the heavy engine will give about 2-3" squish.