I replace the lifters as a matter or course, but I use factory relplacements because some of the performance ones can be noisey. The factory ones are tighter and quieter.
Agreed. I got the "performance" OE style ones from Hughes, part HUG 5006 HYD ROLLER LIFTER SB MOPAR 16.00 $140.00 and never could get the preload right (roller rockers) to eliminate all of the noise. Went back with the Mopar Performance OE style rollers, and it is quieter. And cheaper as well! Part number DCC-5249862 SBM MAGNUM ROLLER LIFTERS (16) $116.95 from Summit.
Could not tell a diff in power between the 2.
They are on my Comp Cams 236-242 .541 lift hyd roller cam. My valve preload is set to 0 + 1.5 turns, FWIW.