Steel Rod Blower Motor??????

I Have A 548 Ci. Chevy 8-71 High Helix At 28 Over . 11.7 To One Runs High 4.20s Low 4.30s On A Fat,fat, Mild Tune Up, Timing At 29 Degrees. I'm Wanting To Pick Up About A Tenth,without Hurting The Motor. I Already Have 33 Passes On It W/out Anything Going Wrong. Bearings Look Like Brand New!!! Do You Think I Can Go Down Another Tooth On The Blower, Throw 10 More At The Fuel And Still Be Safe??? The Motor Made 26 Lbs. Of Boost On A Good Run, Averages Around 24-23 ?? The Plugs Aren't Even...

Steel Rod Blower Motor??????