318 replacement cams....

crackedback said

Overlap is on the intake opening side. That has nothing to do with when the valve closes the chamber to create compression.

Installed centerline will have more to do with dynamic compression.

Ignition timing?

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I have moved the needle on ignition timing everywhere, Sometimes it helps a bit at the best scenario, and runds like crap at the other end of the spectrum. I am at the helps a bit scenario with about 10 deg advance.

And my cam was degreed by what I would call a very capable builder who has done it for years.