If that bracket doesn't work, have a look under the dash of a 73-87 Chevy/GMC. They have a bracket that has the pedals, has the master cylinder mount, and has the steering column mount all in one compact bracket.
I used one under the dash of my 48 REO Speedwagon back in the late 80's. It fit without modification under that dash. I drilled the 4 holes for the studs for the master cylinder/booster through the firewall and the 2 bolts along the lip of the dash and the bracket was in. Even had the brake light switch and the column wiring.