You can buy a caster/camber gauge for $150 or so, I have a used one that I bought off eBay for a lot less. I think the best way to measure toe is to scribe a line on each front tire. I jack up the tire and set up a scribe so it will make a nice line while I spin the tire. Measure front and back side of the tire at the same height off the ground and shoot for 1/16 to 1/8" less in front. I have the NAPA bushings that you're looking at. One of them wouldn't stay in place and would slowly change the alignment setting. In the end, I drilled a hole through the bushing where the pinch slot is on the knuckle and then pinned it in place. I'm using plexiglass squares with grease between them for turn plates and they work quite well.
