The 187 and 699 pans are C body pans. And yes they will work on an A body. I have also read where some people have to enlarge the idler arm dent in the pan.
............some cars need the pan clearanced and some don't, cant remember for sure but I think it matters if ur idler arm has the nut on top of the center link.........if nut is on the bottom I think the idler hits the pan............kim.........