Look & see if any have posted cards (3X5) at the local (automotive)Paint Store. This is how they find work/side jobs.
A word of CAUTION though; Not all are quailified to work on older cars etc. Have them do a small dent & see how good they are first.
BTW: If you don't have 'collision experience' you WILL get fooled and "ripped off" big time. In that case (no personal exp.), just get estimates at local shops till you find a good one.
It's far better to spend more $$ at professional Body Shop, than to have your vehicle destroyed by some KLUTZ that 'thinks he knows.'
Good luck.