Justin frames on Canadian pontiacs would all work from the years 1965 to 1970 but there are minor diffrences in them. all 4 door fullsize frames are the same as your's.we have the same car besides the headlights and taillights if you where looking for a new frame look at 1965-1967 canadian pontiac or chevy they all would look. well the fullsize ones atleast lol =)

could you post a picture  of your frame if the patches are  raised from the frame you could get a soft grinding wheel and you can smooth out the welds just to make it look better TRUST ME the frame looks is not the end of the world drive it hard and enjoy it  you will have time later to fix it up a body off is a pain in the ass really