340 with edelbrock heads overheating

Rusty I have a couple of questions about this.
Generically, would 12 degrees of initial timing be about right?

Second, if he has closed chambered heads, wouldn’t those be more efficient and need less timing? Initial or total?

He didn’t mention if he has 340-specific-edelbrock open chamber heads.

Does the aluminum affect timing?

I would have thought more efficient heads need less timing. Thanks for your wisdom!!

RustyRatRod said

10 degrees initial is a bit low, IMO, but you say it only started running hot with the head swap. You might still try some more initial timing.

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@RustyRatRod