Crankshaft Oil Slinger is it a must or not???

They are a must. You can buy them new at Mancini Racing for $10.

http://search.store.yahoo.net/chucker54/cgi-bin/nsearch?query=oil+slinger&searchsubmit=Go&vwcatalog=chucker54&.autodone=http%3A%2F%2Fchucker54.stores.yahoo.net%2Frestoration1.html