P/S to M/S

The 66 column is quite a bit smaller in diameter than the 67 and later ones. You will encounter problems with the collar that attaches the column to the bottom of the dash because of the size difference. Also, if memory serves me correctly, the firewall plate is completely different from 66 to 67, and again, because of the tube size difference you can't use the 66, and the 67 won't bolt to the firewall mount. You might be better off to use the shaft from the 67 manual inside your 66 tube, although I haven't personally tried this. Good luck.