Oh boy. Valvetrain geometry issues.

Hi Guys. Yet another stumbling block in my build. I'm at the point where I need to measure for pushrods and I am noticing that, using a straight edge, my valve stem tips are at different heights. I am running EQ heads with Hughes 1199 valve spring kit and stamped steel rockers and roller lifters. The heads are used but the seats look excellent. I replaced a few intake and exhaust valves because a couple were bent and I chucked all the others in my drill press and had slight runout on some. Thinking that the replacement melling valves may have been longer, I pulled the "taller" valves and some are the original on the heads so not associated with the new valves. Rough measurement with feeler gauge and straight edge has worst at about .012".
Is there an acceptable amount of difference between valve tip heights?