It is possible to check for lifter rotation before the engine is run. Install the cam, timing set and one bank of lifters without break-in lube (just with some light oil), rotate the block so the lifters are vertical and mark them temporarily with a paint pen or marker. Rotate the engine by hand and watch the lifters to make sure they turn as the lobes push on them, repeat the process for the other bank. Could also install them all at once along with the rest of the valvetrain and use light checking valve springs so the hydraulic plungers don't compress.
