I like these bolts from Mancini and I stick both gaskets to the windage tray with spray on 3M trim adhesive and a small amount of Toyota black sealer on the seams where the cover meets the block.
Here's the link to the bolt s
http://chucker54.stores.yahoo.net/mopenstanset.html
They don't come loose
Gus

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64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60