Is there any reason to replace just the lifters, without changing the cam, too? If they're worn out, it's highly unlikely there's enough cam left to work right. Be sure to do the 20-minute break-in run at 1500 RPM or so before you let the engine idle, or you'll damage both the cam and the new lifters. It basically has to establish a new wear pattern, and the cam/lifter assembly needs to be flooded with splash oil off the crankshaft while that's happening.
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!