Anybody ever convert solid lifters to hydraulic?

Danger, Will Robinson, Danger.

I have not seen the Clifford setup in person, BUT!!!!!!!!!!!!
The slant six hydraulic lifters oil from the top down. The oil comes from the rear cam journal (has a full groove, not two metering hole like the solid cam), up to the rocker arm shaft, through the shaft out the rocker arms, down the hollow pushrods to the lifter. If Clifford does not include "special" rocker arms with oil passage to the pushrods, there is no way for the oil to get to to lifter (the solid adj. rockers do not have oil passage through the arm to the pushrod). As far as I know there is no such rocker arm made. Clifford has been informed of this, but keeps selling this setup. The cam refered to is also a very mild cam. There has been a lot of discussion about hydraulic cam conversions, over at slantsix.org.
It can be done but you need to use a hydraulic cam (available from several sources) and lifters, the Hydraulic rocker shaft, arms, and pushrods. Depending on the engine, it might require custom length pushrods (also available) to get the correct lifter preload.