I am putting the front cover of my 12A after changing the o ring from the front oil pressure regulator and i would like to know the torque spec of the front pulley as I don't want to prematurely wear out the front sealing.

 

not sure right off hand but should be able to find it in the service manual

Foxed.ca - Mazda RX-7 Manuals

 

I believe it's around 85 lb/ft or 115 Nm.

Before removing the pulley get something to keep the clutch pedal pushed down so the front thrust bearings don't get out of place:
https://www.mazdatrix.com/front-pulley-thrust-bearings/

The bottom of that page also lists seals and gaskets you'll want to replace when you take off the front cover.