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Agreed. The biggest issue, fuel boiling point, with the higher temps comes into play with a carb much earlier than EFI due to the lower fuel pressures. That’s always been the biggest challenge running at 200 degrees. I run a 180 stat and the car usually maintains 185-190ish.

That’d probably look great!!

Those low initial timing recommendations might work if you plan to retain the vacuum advance. Otherwise, low initial timing, aftermarket performance cams, and no vacuum advance never play well together. 18 degrees initial is still low. 8 degrees is just stupid.

Can you say vacuum leak......

I would be going down the same path that rumblefish was, looking under the six pack rather than at it. Checking cylinder pressure, and doing a leak down test. Your six pack may be running as well as it can given what's under it.