Cam Install Question

I've got a question about how to set pushrod length. I have an adjustable pushrod checker from Mancini.

But first I'll mention: With this particular cam I had to do as I said, and use the 6 degree retard setting on the Cloyes 9 position Street Billet set. Once I did this, EVERY number on intake AND exhaust opening, closing, lift, duration, ...ALL checked out within one or two degrees. And with exactly the 110 lobe separation angle, so all is good. And I end up with an intake centerline of 107* which I'm happy with. (cam card says 106*)

So next I need to order a new set of pushrods (from Smith Brothers) as my old set of Ersons are obviously too long. Since I am using a rebuilt set of stock 273 rockers how do I figure out length?? I have read that if there are about two threads of the adjuster showing then it's good.

Is what I go by??? (with the pushrods I have, the adjusters are screwed way up in with no threads showing at all.)