I used similar Silentbloc replacements (brass instead of Delrin) for quite a few years and loved them. Only downsides IMO were cost and another place to lubricate. Joe's Delrin version has solved both of those problems.
Unfortunately I didn't change things one at a time, so I don't know which change helped the most. But combined with overhaul and careful adjustment of the steering box plus a general overhaul of the front suspension (including Nylatron bushings in the A-arms), my TR3A steered as easily and sweetly as one could ask for, short of power steering. Change lanes with two fingers; parallel park with one hand; that kind of easy.
Joe's Delrin version will definitely be going into the project TR3.