3751213 cylinder head questions

I think that think has been apart and put back together by a chevy person. LOL

LOL, I was a chevy preson...but take no claim to anything done to this car(YET). Has all bolts but that one, can I just pull one of the others and get another like it or are they different sizes? I think also the rockers are on wrong. I wonder what else I may come across..I already know the wiring is all goofed and honestly scares me to have to tackle as I dont know how it was to begin with, nothing really correct. Telephone line wire has been found already as splices.

I knew this was going to be a longish project mainly due to my lack of income currently but it gets better by the day lol.

EDIT: Anyone know torque specs for the head bolts and if I swap the rockers, torque specs for them bolts also?