Clearance issues 700r front crossmember

[squirel]

I have a 67 short fleet I have installed a GM crate engine and a 700r, My problem is the cross member that goes between the frame rails behind the engine is to close to the bottom of the transmission and torque converter. So tight in fact that I can not get the dust shield on. I can not raise the transmission up as it will hit the floor. Has anyone else had this problem or do I just modify the cross member.