Your experience is lacking.

Because I don't have an m90 car other than the couple I have tuned, here is a good one below:

The car runs 26* of timing tops with a timing curve that goes up with the rpm's. It's the highest trapping, fastest non sponsored m90 only car. He also runs it leaner than **** on race gas.

YouTube - Shawn Mayes Grand Prix GT


I don't really have time to be on this forum anymore, so i'll discuss some other time.

I've also put a regal into the 12.7x range with a 3.3 pulley non-ic with little tuning and he wanted me running it in the 10.8-11.2 afr range.