I have a71 elco with a 350 engine. I have a set of Hedman headers on it. The problem is the back bolt on the passenger side header. It is a 3/8" bolt and it is right next to the pipe so you cannot get a socket on it. The limited space there only allows clearance for a 3/8" angle wrench and you cannot get enough leverage on to properly tighten it so the gaskets leaks there after a month or 2. Want to replace these headers but cannot tell from pictures and description what brand or model would be best here for access to that back bolt. Does anyone have any recommendations for this application?