I've been using Isky Red Zone solid roller lifters and have been very happy. Mine are the older ones (bought in 2006) w/ needle bearings, but have been flawless for years. They now have them w/ solid bushings...which is what I'll use next. Actually they can retrofit my current lifters to use bushings.

As for the not for street use comment, I don't believe that. My KB block doesn't have oiling to the lifters...the lifters only get splash and drainback oiling. Some would say that won't work on the street either. Been like that since 2006 and no problems at all.