Here's a VGS manifold with weber carbs, don't know the condition of the carbs but this is the manifold designed for the m30 which allows clearance for the thermostat housing and brake booster. I have one on my car and they dont come up for sale very often.
http://www.ebay.de/itm/BMW-Alpina-3...537417?hash=item2cbd99d909:g:CygAAOSw7U5Y8lW7
http://www.ebay.de/itm/BMW-Alpina-3...537417?hash=item2cbd99d909:g:CygAAOSw7U5Y8lW7