[img]http://www.compcams.com/Base/Images/Technical/400-200-PushrodDiagramA.jpg[/img] Use a black marker on the top of the valve stem to help you see where the roller contacts. With hydraulic lifters you'll either have to get them filled with oil or change the valve spring for one that is softer than the lifter internal spring. If you're using solids, you don't have to worry about it.
I got the image from this web site.

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'67 GMC 3/4 292 4spd