The v12 wasn't on my plate because I don't own one. My goal is to construct a custom engine adapter that has either a bmw, Chevy or ford bell pattern. That makes things very simple. An equally simple custom flywheel that has would take a corresponding off the shelf clutch.
A custom bell is not necessary nor is it very interesting. For the m100 and m119, thereally is plenty of work to do to get a reasonable flywheel together that can handle the three variety of the ignition timing hardware required. Going with the bell from a getrag 265 or s420 means a small flywheel like Dave said and it means beefing up the clutch. Thankfully that is easy (one you have a flywheel).
Current status is that we know what not to do and we know who's going to make the flywheel. I need to get them some measurements, they need to give me a quote, and then it's a matter of cutting them a check.
-cth
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