I vote for neither! The "Man" Smokey Yunick absolutly hated Chevrolets Mickey Mouse rocker system and tried his best to talk GM into designing a shaft rocker set-up for the small block way back in the late 50s,although reletivly expensive initially they are the best way to go,of course after you factor in the pricing of some good roller rockers,poly locks,stud girdles and all the other parts and peices that were invented as crutches for said rocker system shaft set ups seem to me to start making sense,that is if you're doing something serious anyway,also I don't think the self aligning rockers would work with a solid cam! Later,KillerDave