[Thanks for your reply. On my stock '64 Galaxie there is a stamped steel ( about 1/8" thick) riveted to the frame. Attached is a picture of the stock flange. 1/2" shoulder bolts are pressed into the flange from the motor side and the stock, cast cross shaft is slip fit to the bolts. Shims are inserted between the flange and the shaft to adjust alignment. A picture of the stock and the new tubular cross shafts is attached.
Since my first post, I have discovered that, not only is the center to center distance a problem, but the bottom of the tubular cross shaft hits the bulge in the flange because the stock cross shaft is "bowed" to clear it.
Thanks again and I hope this makes my problem a little clearer.