Get a permaseal one piece mani gasket. They used to last me a few months of boost, were the 2 piece ACL ones would last a couple of weeks befor the burn out between ex ports 2 & 3.
Made off all metal as well, not that shit ceramic stuff.
They cost em $6.50 each from Bursons, but I buy a lot, so get great prices.
Lappy is also correct in what he says. Pretty much every K mani gasket IS a big port!!!!