10 psi will be fine....well proven they will survive ok up to 12psi with tbe M90.
I seen a chart showing the M112 produces near on twice the boost of a M90 and i still have stock compression ratio so i wont be taking any chances.
The 8 rib pulley is fine, leave it there.
You can run the 6 rib belt on it no problem.
Yes i know but it don't look right, if it works out the boost is what i want and i keep the pulley ill modify it back to 6 ribs.