Fancy ground straps.
My 292 in my 66 never had any for some reason...or any that I remember...its been awhile since I've seen it. haha. My 305 v6 has 1 on the driver's side valve cover to the fire wall. It didn't even matter weather I left it off or not. Not sure if I'm gonna use any on the new engine either...hope I don't need to.