Re: header issues
I cut an open end wrench of the appropriate size, to about 3" in length. This works for me. You could also replace that bolt with a socket head cap screw. Then use an allen wrench or socket. I have had good luck with my Persey Dead soft aluminum gaskets.
69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1