5.7 0r 6.1 with msd hemi 6 and carb

Mr Hemi said

28 Degrees only? I would test it on a chassis, but use a total of 36 and do changes in 2 degree increments until you get max power. With the hemi chambers and the aluminium heads it should be ok with lots of timing just use the correct octane rating for your compression ratio.

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By all means test it. I seriously doubt you'll see much hp increase over 30 degrees. I generally stop adding timing if the hp gain is less than 5hp.

Remmember that these aren't decades old engine designs. No benefit in transfering outdated LA tuning methodology. The combustion chambers are specifically designed for the fastest burn possible.

I would love to see you testing results regardless.