FWIW, here's a thread with pictures of the A body HD pedal set. They don't show the firewall brace plate............
https://www.forabodiesonly.com/mopar/threads/heavy-duty-clutch-pedal-assembly-value.402441/
IIRC, the DC bible recommended extra firewall bracing for power shifting with a high load (3100# (?)) B&B style clutch cover to reduce deflection.
IMO, the small stock Abody inner fender torque shaft brace is almost adequate for a standard duty 10-1/2" clutch set.
Likely you know new TTi torque shafts are available.