If you want to really get the slop out, replace all the hinge pins with 0.112 hinge pins. I made some out of 0.112" O1 tool steel. It's available at McMaster-Carr (P/N 88645K66). I just carefully cut it with a hacksaw to match the length of the stock hinge pins and deburred the ends with a Scotchbrite wheel. The slop is basically gone (70%?). Make sure to use clean soft jaws when you hold the stock. It's easy to burr up the surface of the pin in a vise, if there is junk it the soft jaws.

I haven't replaced the outer hinge pin in the rear suspension because I need to get a reamer to ream the hubs, but will do that soon.

After I replaced the pins, the suspension had some drag / friction. I ran a couple of packs through the car and they were nice and free. It didn't take much to wear them in.