Doug's headers with studs?

I run studs in all my engines on my 340 with Edelbrock heads with Dougs headers there were 2 bolt holes that studs would not work because i couldn't tighten the 12 pt nuts up. No wrench would fit the in that tight a spot so I just used bolts and an open end wrench. PM me if you need pic's I don't have my camera with me