Oh NO!! not another small block build

If you use a ridge reamer, juuuust take the ridge out and not a smidgen more. They bevel the top of the bore a bit...sort of a reverse taper that you don't want the top ring to have to deal with. (Anymore, I just fresh bore and not worry over that.)

OP, practice with those bore gauges quite a while first. I have used them for a long time but they are not simple to use AND get accuracy. The handle has to be perfectly parallel to the axis of the bore, if not, then the readings will be high. The 'tee' has to be exactly in the center of the bore, or the readings will be low.

How I get good readings is easier to show than describe. But even with care, you can't count on much better than .001" measurements, and that takes patience and practice to get that good. Good enough for stock work, finding taper and out-of-roundness.