The cable shifter would eliminate a huge hole in the tranny tunnel but the amount of clocking will play a huge role in clearance also. Body lift will help. If you keep the 300 factory clocked at 23(ish) degrees, you may not need to cut anything. Completely flat clock you're almost guaranteed to have to cut. I wish I could help more but I've only swapped a 300 in an XJ with PSD.