there's a broad range of tolerances there, a few 727's will clear w no banging, most will clear with flattening or removing the pinchweld, a few need the tunnel hammered for clearance in addition to the pinchweld removed. BEST is to mock one up in your particular vehicle & see what you have, a person sure doesn't need to be hammering if they dont have to. Trim the crossmember on the one side w a whizzer to get it exact then remove it & weld some flat pieces across the gap you have created. 727 bolts in the same.