Hey guys: Thanks for the leads!
I found a digital dial bore gauge that looks like it will fit, it's not too cheap, but styles like the old Federal clock dial ones often look worn out. Old Federal Dial Bore
NEW Example: New Digital Dial Bore 10" long, 2"-6" bores
Looks like it may do cylinder bores, and possibly main bearing saddles, and big end rod bearing for inserts?

So, now I'm still trying to find a good cam bearing installation tool for these in-lines. My blocks are about 28" long and I can't figure how to remove and install new cam bearings with the darn V-8 tools (they look too short!).

PS--Curt B, I have tried those telescoping gauges and I have trouble getting the same reading to repeat itself. I think I just don't have the "feel" for those telescoping tools!