[327chevy]

I have to go through the same thing as you with the broken manifold bolts and I asked a local independent shop what the easiest way to get at the rear bolt.From what the guy working there told me,and I've known this guy for most of my life so I have no reason to doubt his advise,if you remove the inner fender it will supposedly allow you the room to get the inner bolt out.I'm rather skeptical on this as I'm with you on here there is next to no room to work in next to the firewall but I guess the best way to find out if it will work or not is to try it and see.