1969 Dodge Dart Engine Stutter

There is an unbelievable amount of oil and grease build up down there. An absolute mess, making it very hard to locate the leak. There is so much oil built up that I am actually concerned about the runoff.

Any thoughts on using the dye and a UV light technique?

Just talked to a fellow at autozone. They don't have the oil dye but said I could use AC refrigerant dye in the oil. Said that it works just the same.