Mike at L&M Customs charges $2500 for a boost proof built 545RFE
(+$500 if you prefer to keep your trans and buy a core from him)
I pushing 500WHP, Ripp Stage III Vortech V3, 8psi boost at 5800rpm
Spraying water/meth that's triggered when Boost hits about 4psi
to help keep my pistons happy
Racing it in 4WD 4-Auto on Four 28" Mickey Thompson Drag Radials, ATS Triple Lok 3000 stall torque converter...
There's at least 3 of us in Edmonton running virtually the same setup.
even on my heavy street set (305/50R20 Terra Grapplers on stock 20's)
I'm rippin shit up BAD!, destroying muscle cars at will with 4WD Full throttle launch
Damn near in the 3's 0-60
Click my sig pic for a link to my build thread, or
a you can find LOT more posts in the 5.7L performance section on superchargers and transmissions:
Here's a few to get you started: