I'm puzzled too. Surely you're using a donut and not a flat paper gasket.
Even with the bestest mounts, the engine is gonna move a little.
The pipes need move with it. Rigid hangers too close to the engine ?
Good luck
The gaskets are flat, but they have a metal ring in the center. Will a donut gasket work with the flat end of the manifold? And aren't they usually made out of a paper product that will eventually burn out?
Maybe I'm a big dummy, the donut gasket is something I didn't even think of, and not one parts store even listed a donut gasket.
And stop calling me Shirley (Airplane movie reference!).