I am doing the same thing, I have a 350 with headers, I had to run three single u joints with one support and bracket up to my steering column, The joints were from Borgeson. I had an old GM column but got rid of it and went with a 32'' ididit column, looks alot better. Just tell them what you have, for the column if the shaft is a double D or spline etc. your steering rack is mustang so if you have power it is a 3/4 36 spline or 9/16 26 spline for no power. they will match the joints. for getting the saft length right is a bit of work, they have a formula on the web site.
