The 2" bars are still available however they'll have the same interference with the 427 hardtop as the 1 1/2" bars. If you cut them down to fit under the top the 2 forward openings for the hoop will have to be enlarged but more involved modifications will be required for the rear leg; the chassis stub will have to be cut off, moved and welded and the opening in the body will need to be filled at the rear and enlarged at the front.

Jeff