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

Yesterday I found a guy in town that supposedly specializes in old cars, and he came highly recommended, so I gave him a call. He's booked until June 20, so that's when my appointment is. I usually take it as a good sign when businesses have to book you days or weeks out. When I spoke with him on the phone, I asked if it would help if I brought specs for him, he said no need, the numbers are all in his head. And that he's been working on these cars since they were new.

I remembered that I bought this old thing and have never used it, but I'm uncertain as to how I'll mount it with my banged up dust caps...
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I used to have one of those. You pull the grease caps off first to use it.