Vacuum leak driving me nuts!

Google Gippsland Pentastar Restoration Services (GPRS), go to their website, and order new intake/exhaust gaskets and the hotbox gasket. They are in Australia but will have the parts to you in a week or so. They make the best gaskets available for the old slants and their quirks. Nev and Kevin are great to work with. Took 'em 8 days to get gaskets to me, but they were in the middle of a brushfire that got within 150 feet of their shop. Hope this helps.