SM Head Install... forgetting anything?
^^^ Those look similar to the Hooker Super Comps the previous owner of my car put on my 360LA. Same impossible to get a socket or wrench on bolts. I did not even try to get em out gently...
I'd recommend for those hard to get to bolts go buy a cheapo 12pt box and and cut about 1/4 of the circle out of the top. That should allow you to get onto and tighten those... albeit 1/16 of a turn at a time.
GL!