Lifters

["John DiFede" <JDIFEDE@cablevision.com>]

I'm installing a new cam this winter, and I see that there are Heavy Duty 
lifters that are offered for sale.  Is there that much of a benefit in using 
the HD type?  The HD type has a drain in the side to allow for better 
lubrication of the cam.  Has anyone modified a stock lifter by drilling a hole 
for oil drainage?  I already have a set of brand new stock type lifters.
Comments, suggestions?