MP Dizzy?

RustyRatRod said

If you put initial where it really needs to be for performance, all of them really have too much total, unless you limit them somehow.

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What are some good number for initial and total? When does it become a requirement to start limiting mech advance? I suppose what I am asking is does it even help on an otherwise "stock" engine such as a 5.9 truck motor with a carb an no other mods?