The only rivets I have done hot on an A are on the frame and pickup tailgate chain brackets. All body and pickup bed rivets are done cold. You will need an air chisel, a buck, and rivet forming tools to match the rivet heads. I made a buck out of a 12" piece of axle, that I drilled a hole in to accept the 0.401 shank of the forming tool. This is a two man job. One man holds tbe rivet in the hole with the forming tool inserted in the the buck. The other man uses the air chisel with another forming tool to form the head. The protruding rivet shank length is very important in forming the proper head. Some may need to be cut shorter on a grinder for odd thicknesses of sheetmetal. This will come with experience. Practice on some scrap first. If you are assembling many parts some Cleco's will be handy. I can add some photos when I get bome or PM me.