Valve and cam questions

In my SB, I used Rhoads leak-down lifters, which are supposed to give smooth idle and good mileage, but still fully use the lift of the cam at high rpm. I have wondered if the same is possible in a slant. One would need a hydraulic cam (~80+ engines?) and I think most of those are too mild. I have an extra set of SB lifters, but wonder if they fit a slant. I read that SB & BB lifters interchange. Oiling is different in slants, at least early solid-lifter blocks.