If you think you'd be more comfortable with a hole- - - - -drill one. The lifter won't care. Just put it near the bottom so oil can't be trapped in the hollow lifter body. That's the reason for the hole in the lifters you're seeing in the ads. If you're installing a new cam and lifters, don't trash the old parts. Both the cam and lifters can be reconditioned.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!