Commando valve covers
The bracket is for either the wiring harness or one of the heater hoses. In any event this cover is intended for the passenger side of the motor. I havent seen a commando like this before, Ive seen stock (not commando) 71 or so A body 340 small block covers that have this bracket, however. Maybe someone transplanted the fins from a commando set onto a 71 set ??? Not sure. I have a later set of commando covers that use the grommet pcv - so I speak from experience.