I should mention in particular if anyone has any engine bay pictures of any of the Group C RX-3's, showing the various inlet manifold designs and variations these cars ran, 48 IDA's, IDF's, DCOE's etc, and any underside pics showing the different exhaust systems that were run.
I actually have, what I was told by a very reliable source who has since passed away, a set of twin HD8 SU's (ex E-Type Jag no less) on a manifold that mounts to the original RX-3 inlet manifold, that was fitted to a Group C RX-3, but would love to know what exact car it was used on.