I use Crane Superlube for flat tappet cam oil changes. I looked up the ZDDP levels in a bottle and calculated I needed a half a bottle to supplement off the shelf oil to bring it to the proper levels.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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