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Not sure about the vac-bagging and resin infusion side of things, but I've used a similar technique with wet lay carbon around a foam buck. You'll need some barrier between the carbon and the foam otherwise the foam will absorb the resin. Packing tape makes a good barrier and has the advantage that it works as a release agent so you can remove the foam by just cutting it up and then removing the tape without having to dissolve out the foam.
Brommers
@Dammit
Boring old vans to one side, if I want to make some complex shapes (three trumpets to a plenum) is a good technique to use to carve a block of foam into a slightly undersize version of the form that I want, then wrap that in CF fabric, bag it and pull a vacuum to draw the resin through, then use acetone to melt the foam out?