You're absolutely right about the troubles that mass airflow meters can cause. If you run into any issues, would there be an option to convert to MAP based system installed in the charge pipe prior to the manifold? Anyways, sounds like you're pretty confident in the MAF working.

I like your hp goals but I'm concerned about the internals being able to handle what your throwing at it. I'm sure that detonation and knock won't be issues if you have the tunning spot on but, if i'm not mistaken, the SRT has reinforced internals for only 330bhp vs your goal of 425bhp on base internals.