about a 1/2 to 3/4" notch the width of the radiator cut into the cross member, and notch some of the cross supports for the hood to shut. that's if you want it to stand straight up, alot of people lean it to make it clear but to me that's ghetto. a dremel w/ a cutoff disc will make short work of the hood and a sawzall or jig for the cross member.