Did you ever have the old 906’s flow tested?

More than likely, a set of cleaned up Stealths would outflow the old 906’s...... and since if the 906’s weren’t cracked you’d be reusing them....... they should work at least as well as what you were originally going use.

That’s the least expensive path forward.

A set of “stage 1.5” Stealths will outflow all but the very best 906’s(285-290).
Ootb they’re usually in the 255-260 range.