Current options on multipurpose lifters?

Pull the noisy lifters in order and disassemble and clean them, possibly change out the check valves inside as most lifters are the same anyway. a flat tappet lifter is different than a roller lifter. Schubeck used to make a $$$ ceramic faced lifter that could be transferred to another camshaft but they went under. New lifters are inexpensive in the scheme of things, have you checked the lobes on that 'ol Roadrunner cam? I had the same cam in a 340 with 3.91's and really liked it.