Unfortunately, there is no steering column changes that can be made on a post-57 C1 that will give more room. The bottom of the bell is right up against the tach housing of the lower cluster, and can not move forward any.The flaming river column will not give any additional clearance, and the FR column is fugly as well! Their column has no taper to the bell and is just a straight sided bell with a flat bottom. The Ididit column, more replicates the original style, but still offers no additional room. About the only reason to put one of these columns in is to use a rack and pinion steering box, and to get rid of the troublesome turn signal switch. The smaller wheel, and lowered seats are the best solution.
The 59 that I am building now uses some wiseguys seats that lower your seating position over 2" and move the seat back 2" more to the rear. I also am using a 15.5" steering wheel, and an Ididit colum hooked to a C4 steering rack.
I also built a custom lower cluster that allows the column to move 2.5" further foward. It is impossible for me to drive a C1 with the top up without tilting my head to one side to clear the top bows, and at 250 lbs, the wheel clearance was a little tight!
Here is a pic of the cluster and column that I fabricated for thr 59.
http://www.villagephotos.com/pubbrowse.asp?folder_id=999962
Regards, John McGraw