i read your question about the 64 fittin on a 72. i asked someone i no who deals with this type of stuff. and he said that appearance wise the body looks like it will fit but the frames are slightly different so some minor mods may need to be done.
por (paint over rust) kills rust it comes in black,grey and silver its a pain to get off of body if you plan on using it on the body and takes weeks to get off skin if it gets on ya thats about the best i can offer don't know is its what your talking bout
Be shur your parts are completly free from rust first,wipe on melaletch,then etching primer,.I use primer sealer.you should be asking a professional,where you buy yuor supplies local.they provide service toassist in these matters!
choo eching primer will help stop the rust better then reg primer it reduces with an acid reducer so don't get it on ya and its ugly green color if ya look at pics on my page u can see it