New members here trying to put back together a truck we didn't take a part

We believe this to be the original parking brake bracket to hold the cable at the frame end?
Photobucket album We are guessing this actuates the original parking brakes? Can't figure out what else it might be?
Photobucket album If we are correct, we are planning on removing all of this and installing a line lock to replace the parking brake, any reason I shouldn't do this that anyone can think of?
We also have this contraption that we are guessing are related to the original pedal assembly? Again, planning on removing and replacing with more modern equipment.
Photobucket Album Hoping we linked the photos correctly
We really appreciate any insight.