I have a 1973 scamp with RB and 727. I have reviewed many threads on the OD install with options from cutting floor pans and tunnels to altering the transmission crossmember to lower the tail of the transmission to get clearance for the OD unit. Has anyone tried to use an aftermarket crossmember like the uscartool for a 518 transmission and welded the mount to accommodate the transmission in a lowered position? Any comments both positive and negative on this approach. I can change the rear pinion angle if needed by angle shims.