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Problem fixed. First suspicion proved correct, the leak was coming from under the 1" riser. Sprayed some engine start around the base with the motor running and sure enough the revs picked up slightly and the whistling stopped momentarily. Two new gaskets and all is now good.

Thanks Scampy, we like to throw a "y" on most things down here, carby, dizzy (distributor), etc..thanks for your help though I will try it today.

I have finally got my 1970 Duster with 440 on the road. One niggling problem that I am having seems to be coming from a vacuum leak. The motor was running an AFB Competition 750cfm carby, when idling it would run a little rough with a big flat spot off the mark, then under load a loud whistling...