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The new heads have the same size combustion chambers as the old heads right? What about materials, were the old ones cast iron or alum? Base timing (or initial) is much less important than total timing advance. Max rpm is determined by the parts in the bottom end as well as the valvetrain. There is no good reason to spin the motor much beyond the max power rpm, even if it will hold together.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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