I had to shave the top of my torsion bar crossmember, reinforce it, and have a local shop fabricate a mount when I added my O.D. I can't tell you about the front mounts. I'd say you need help from a chassis fabricator or good welder.

1962 Fleetside 4spd 235 w/O.D. posi 3:90
In the Stovebolt Gallery
1990 Subaru Legacy Wagon AWD 2.2 5sp
2013 Ram Tradesman C/V
My Webshot Photos]