Should I Use a Splined or DD Shaft?

I used all unisteer joints on mine with flaming river column...Although not a A-body car, the concept is the same......one had splines on one end for the rack and the other end was DD...then went DD shaft up to another joint with 2 DD's....then another piece of DD shaft through support Heim joint up to another joint with 2 DD's and connected to the column....I have some pics below.....Also, a little tip; it helps to mach it up with wooden dowels ahead of time and get your lengths, angles, and support weld area marked and chosen as a wooden dowel is about 3 bucks if you screw it up.....Instead of cutting DD shaft wrong length....Especially polished stainless steel like I used....I think it was 100 bucks or so for 24 inches of it