The hole size would be 7/16 fine, same as small block chevy.Maybe a inch and a half deep(1.500), I would use a speedy sleeve only if there is a groove in the balancer, as far as your balancer just look at it and see if the rubber is falling apart, if its not then use it, if it runs true you should be ok. As far as having a stud? Just get a installer and use that.Works the best when you put a small amount of oil on the crank snout and balancer, some people even use a small amount of silicone to seal the key ways from leaking any oil past.
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