340 Main Bearing Clearance

Question on choosing a Bore Gauge - I see shaft lengths varying from 6" to 10" . What length are you guys using
that avoids colliding with adjacent bearings/caps ?
I bought the Jegs bore gauge, 100 bucks back then. I do one cap at a time and sharpie the readings on the cap or pan rail.
I've used it to align caps as well...
Last week I just measured a Suzuki 4 cyl for a friend who is re ringing it. std bore, no 2 was 2 thou smaller bore than the rest..bore taper thrust side was .0015-.002 for all.
Oor. 0018