Milling an intake manifold.

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What machine shop doesn't have a way to cut precision angles? I have a hobby machine shop & have three different ways to accomplish precise angles without thinking about it to hard...
We only have a couple local machine shops, neither that I have had spectacular results with, and both turned down the job. My buddy is a retired machinest that retired, moved, and hasn't built his garage yet. Most of his tools are scattered and we went into this thinking we could do it on his horizontal mill since I assumed it would 90*. He has the tools to do it, just needs to get them together. Thus I was trying to help him out if anyone had some quick ideas for fixtures. If the intake wasn't a 40lb chunk of cast iron it would probably be easier.