The angle of the intake pushrod is going to load the intake rocker towards the exhaust rocker. On my W2s, I used Crane rockers with aluminum blocks from Arrow or someone. Shims were used to adjust play, center the roller on the valve and also as thrust washers. Initial set-up, without pushrods, starts at the center and works out, keeping in mind the intakes rockers are being pushed toward the exhausts. I kept my clearance snug. As long as no parts are replaced, this should only need to be done initially. Beyond that, just verify clearances and alignment, and adjust the blocks when installing to maintain that when putting it back together.

That's how I figured out how to do it. Ran them for years to 7200+, with the oil restricted to the heads, and never had an issue.