[BruceWilkie]

Originally Posted by blueghoast

I just wasn't sure how it would do with making that much timing diff all at once.
I'll try it and let you all how it works. We were sopposed to do a little
street racing tonight but the damb rain won't give us a break.

GT.

Start with less and work your way up . Keep in mind that unboosted your running a low compression motor on premium fuel! !!

Deb's 406 originally had 6x-8 heads. Ran fine even on 85 octane from the reservation pump. On 93 premium it notably felt slower. On 93 advancing to 20 initial brought response back but still required limiting total to@35 or you would risk light high rpm ping on a hot day-hot water temp as it approached 5000 rpm. That's a whole different curve than if setup for 87 or less.
20 initial allowed hot starts without kickback or to slow cranking. 22 was ok when motor was below warmup.
I put timing back to a "normal" 12 initial 36 total in by 2500 and convinced Deb her motor could run the cheap gas with no issue.

So...start with finding your motors "happy" initial advance for hot(heat soaked) starts. Keep your unboosted advance total "normal" . Pull timing as motor gets into boost. You'll probably need no more than 24-27 degrees final timing boosted at peak rpm.