My car was purchased at auction from collection of deceased Pontiac dealer. The car originally came from Maryland.
My gas tank leaked like a seive when I got the car.  After taking it off and cleaning it, I found about thirty holes in it.  I plugged these with a gas tank sealer and then sealed the inside of the tank with a POR 15 kit being very careful to get it as clean as possible and absolutely dry before installing the sealer.  I found using a vacumn cleaner and directing the flow through the tank really helped to thoroughly dry it.  So far, so good.
    My old car also has 13/16 lug nuts which had me puzzled for a while.  Evidenty, other general motor vehicles with a large hole pattern with 3/4 lug nuts will fit.    Why would the lugs be different sizes?  I thought I could not find other wheels for it.  Like, all of these old cars, the left hand threads on the lugs ares a little confusing also until we notice that one bolt  is marked with a L.