anobolic sealant for the snout. anaerobic sealant - Google Search is what you should use on the snout to blower case. use a thing smear and bolt it back on.
i used high heat black rtv years ago on mine and its not failed me yet. but i later learned this is what you should be using. you can get a coupler and new oil for a lot less then a dealership these days, you wont find the oil at a parts store. dealer or ebay only.
my local dealers sell you two 4 oz bottles at 20 a bottle. green couplers are best too. 8 oz Supercharger Coupler Oil Change Kit fits Eaton Ford Pontiac M90 M112 M122 | eBay