How to "rough in" front end alignment after rebuild?

Ironracer said

I don't get it. What do You bolt it down, ( the 2x4 with the nail) so it doesn't walk around? I've never seen it done....Sorry to Bother Ya Dell. Or is it better to run a string/ laser off the rear tires as a benchmark. And measure in from that?

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I don't do toe that way if that is what your referring to. Crackedback mentions this. He just lays a board outside of each tire on top of something to block it up so you are measuring about spindle height, and sticks out the front/ rear of the tire so you can lay a tape across for toe measurement.