Bottom of lifter worn thru

cam break in is crucial, on my triple valve spring engines we pull the third valve spring for break in. before fireup the carb is primed, the timing light is hooked up and ready to go and a box fan and a garden hose in front of the radiator...once fired set the carb for 2000 rpms and set the timing quickly and varie the rpms adding rpms here and there by hand and letting it slowly go back to 2000 the idea is for the lifters to spin in the lifter bores the whole time once the cam is broke in they will spin even at low rpms on a new engine I will run a brake hone thru the lifter bores but even a piece of emery cloth to deburr will be helpful