on a 58 w/ 2bbl 283 [click "full size" on the right of the pic] ... I believe it's shown in the assembly manual also ... kind of hard to get a good pic when it's all up, but the 58-9 have the mounting holes on the firewall in the right place, just needs to be bolted on with the pedal end poked in the hole, then the threaded rod hooked to the carb
Bill