I think I might have asked you about this in the past....but I think you need to make nipple sockets
The problem with those is they made different sizes for small block and big block, there may be some year to year difference too (I am not sure) I would need to have someone to donate one set of nipples of each application to reverse engineer each set. In return I would make them free prototype tools .Not a problem, I just have to have them all in front of me to do it. I am not too sure how many people would need them. But I can make a few to see if there is any intrest