I would play it safe and stick with a '64 Full Size Chevy Auto Column. There are plenty of them available. Now, a '64 Column will be from a Powerglide Trans. The 3-Speed Trans was not available in '64. You will have to research on how to make it work for your TH 350. Also some may say a '63 Column will also work, but it is a little different as it has a Larger Cup where it meets the Steering Wheel. You could also check into an Aftermarket Column, if you decide to go non-original.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America