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Now the next question, and GOSFAST already brought it up, is who set the spring height and pressure and how did they do it?
"I'm assuming you haven't gotten anywhere near the spring hgt/pressure requirements yet? I've posted up here many times against using the Chevy length valves and am in the middle (still) of setting up an "adjustable spring-seat-register" to deal with this very issue. Comp Cam's is holding us up at the moment with mfg the necessary spring seat locators for the Flathead guides."
The only reason I bring it up is if your going to all of this trouble with the clearance issue might want to be sure the spring height and pressure is correct.
I have never heard of anyone recommending used lifters on a new cam. The used lifters might explain your variation in lifter height. Used lifters can be resurfaced but I thought they were not a flat surface and had a slight curve to them. I'm not a used parts (in this area) type of guy, need an engine builder with used lifter experience to jump in on this one!