273 taper limit?

I was hopen you would chime in tmm! Havent checked the out of round yet. Dropped my dial bore gauge & busted the needle off! so i resorted back to the ol T-gauges & big micrometer until i replace the dial bore gauge. Do you remember off hand what your masure ments were upon your dissambley? As you know i have that other 273 thats never run yet with flat tops & was thinken about pullen those pistons & droppen in a set of egges domed pistons & go becouse all else is done with that block other than re-ballence.