I've been 50+psi and as high as 7400rpm on stock ignitionMid 9's with my street turd at 143.. Stock ignition, 26-27# boost.
However, I didn't try 40# boost, either. Not sure what the stock ign would do @ that level.
The problem I see now is the availability and quality of replacement parts.
Burning both e85 and methanol.
Stock ignition