You might want to look into a local Ford club. They would probably know the scoop on different connections for repairs and restorations.
I have a friend that used to be in a Ford club in the cities. He now works part time doing mechanical repairs with another friend as a sort of high end ‘flipper’. Not what you are looking for but what I gather from discussions with him, you may get some good information through a club.
Then again, as always, buyer beware. I’ve heard his story about being screwed by someone with a good reputation as an honest builder on a set of Cobra Jet heads too. Basically “lost” the heads to the rebuilder. No good.