Firm feel steering improvement?

I'm looking to improve the steering reponse on my 65 Barracuda. All the linkage is new and I have a new 16:1 box, but it's still slop in the steering going down the road. Firm feel sells an idler arm with bearing inserts (is this a kit you have to install or is a complete arm?) and a brace for the pitman arm. Anyone used these and is it worth the price they are asking?