usually, a support bearing is used when having three joints in a steering shaft, but due to you having a sort of long shaft sticking out of your column, and the standard "long" rack shaft, i think a support would be insurance against any possible deflection. here is a shot of the support on my humpback project. it's a 3/4", .007 oversize, heim joint, available in a bunch of places especially made for steering shaft support. the oversize allows for a painted shaft installation. my shaft runs from the firewall, through the header tubes to the support, then to the rack. the steering is very smooth in operation. just a suggestion i would do if possible on your setup because of the extended column shaft.