a 833 conversion

I wouldn't dent the cross member ever, besides how hard the steel is, it's a structural part of the car.

Look at mopar muscles o3-04 issue where they do the gear vendor overdrive in a '69 dart, they also grind off 2 of the rearward front bosses.

It's the smart thing to do for clearance
I'm not sure why the poster above would say you don't have to grind it when inevitably he did.. contradiction?
I had to on mine '67 valiant' and I have not mod'd my cross member like they did to clear an overdrive unit.
no big..
here you go.

http://www.moparmusclemagazine.com/..._0310_installing_gear_vender_units/index.html

mopp_0310_24_z+gear_vender_unit+front_shifter_mount.jpg