With the new technology in clutches there's no need for it
My last clutch was a old school Hays MarkXII plate with 2100# static pressure with 10 gram counterweights and I never had any fire wall issues. I did install a gusset under my dash from the pedal mount to the underside of the dash.I also modified my Z-bar to double shear at the clutch side with a rod end instead of that hokey razor sharp clip deal from the factory. I will be back down in the shop tomorrow and I will try to snap a pic for you.
Gus