dolphans1

Hello, I was trying to get some information on removing my 4 carburetor holders from my intake manifold on my 1979 Yamaha XS 1100 Special. My concerns is, they've been on this bike for over 30 years, is there anything I should do or not do to get them off? I'm concerned about the bolts being frozen inside the intake manifolds and looking for the best technique to remove them. Thanks, d-1