I am sorry that your visit didn't go according to plan, but 95% of mechanics will not even do a manifold. I've been doing exhaust for 30 years and have done 100's of manifolds over time I even do them for dealers but certain ones that come to me I have to turn away. Your car had broken bolts in the front of the head which makes it a liability for me. If something went wrong and the head got damaged, which could happen when bolts are already broken, then I would be responsible.
I do not know anyone besides myself that does manifolds so I could NOT recommend anyone to you for this job and I am sorry that I was not able to help you. I do not only do easy work or coast, I just stay away from jobs that could end up costing me money and an unhappy customer when something went wrong. If the head got damaged I would not feel comfortable passing on that extra cost to my customers.
I hope you understand my position.