Dad’s 1969 Dodge Dart Swinger 340

Side note. I have a lot of the original fasteners. My plan was to clean them up and black oxide them. Then paint the ones that need painted. I purchased a vibratory tumbler and green rust cutting media from Harbor Freight. I tossed in a few bolts and let it run overnight. Nothing really happened. I dont know why, but it had a negligible effect if any. Toss the same bolt in the sand blast cabinet, and 20 seconds later its perfectly clean. I dunno