I know you care and love this stuff, like I do
This quote from 45cat might help you in your search for Lee David
"There is a photo of Lee David in one of the trade publications when he signed with Janus. He played at Palisades Park (in NJ) the weekend of July 1-2 1967 along with the Drifters, the Age of Reason,
Jean Wells, Linda Jones, George Carrow, the Shandells, and the Petals (plus on July 1, The Four Tops), according to Record World July 1 1967 page 27."
Some stuff here from 2003
https://soulfuldetroit.com/archives/3838/3138.html?1053020980