Are you sure there are welded nuts on the frame? My '56 has a nut plate with 2 threaded holes in it. I fabricated a new one when I went to dual cylinder.

http://www.jbhardin-gallery.com/trucks/nutplate.jpg


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.