Magnum Exh manifold machining.

Seems trying to find someone to shave some material off the face of an exhaust manifold requires a secret handshake and a decoder ring. Is it really that difficult? Anyone know a shop in San Antonio that can do it? I've already called Duffin, no go.
Parks engine service. Seguin, Tx
830-379-4562
They have resurfaced exhaust manifolds for me before.