Super hot headers at idle!!

I run Edlebrock heads. Try setting full mechanical advance to 38 degrees at 3000 RPM. Make sure you do not run any vacuum advance, even after you have set the timing. With your lift the timing maybe to high, and will have to back it off a little. My sons motor with ported eddie heads, had the best dyno test at 34 degrees were mine was 38. You never said what distributor you have.