Thanks, After slowly removing the bolts closest to the center of the car with an offset box wrench (1/8 turn at a time) I was dead in the water until a neighbor (who is also a gear head) asked if I had tried a distributor wrench. I tried the old one I used to use on my '64 GTO which is 1/2' and it worked beautifully but still 1/8 turn at a time.These bolts are unbelievably tough to get out/in. I have a 1970 roadster and feel your pain. What I did was purchase a cheap wrench, heated the end and bent it to a shape I thought would work. It did work but it was slow going, 1/8 of a turn at a time, took like two hours to get those two bolts installed.
Best of luck