I've decided to put this project on the shelf. The amount of work to make it is too high I think in the context of the risk it won't be successful.
I think it might be better to roughly make two inlet manifolds from steel tube, each replicating the runner lengths/diameters, plenum chamber volume and throttle body size of the ex-Falcon changeover manifold, and then test them both on my dyno. Obviously they can hang out of the engine bay during that testing. I could MIG them together much faster than fitting the aluminium changeover manifold. But even a pair of rough steel ones would be a lot of work to make.
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