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You still have to use the degree wheel properly zeroed. a solid lifter and your dial indicator to know where the cam is really fazed.

and those spark plugs are way too cold!

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I tried another set, hotter, more of a race plug. Didn't help at all. Blacker than black after 20 mins of run time! For sure, not complete combustion. Jeff

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You have C57YC plugs in now not much more race around that that these are for 13 to 14 to 1 compression.

I would try champions RC12YC get street plug.

I would borrow a know good carb.

I would re check cam degree "with a solid lifter!!!!"

Then I would check the spark

Then I would start backing the pre load off 1 turn at a time till it starts to tick on all cylinders. if it takes more than 1.5 turns probably your problem.
Just My