Operation Torquey-Pig

You’re going to find that the most reliable hydraulic roller link bar lifters are Crane and Crower. But, if your wanting to go mechanical Roller, then the BAM are what you’re going to want. But there’s a caveat involved, too. There aren’t any shelf variety mechanical roller cams that could be considered “small” on the .050 and advertised duration figures. This one probably would come closest to what you’re looking for in a solid roller
COMP Cams Xtreme Energy Camshafts 20-743-9
But you’d really be better off getting one custom ground.