Why is it idling so high? And if it's soot, that would indicate a rich mixture. I'd be curious on your timing setup and air/fuel ratio.
As far as coating lifters and the cam, I would think Comp cam lube should work fine. https://www.compcams.com/cam-lifter-...oz-bottle.html
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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