Am I ok with this? KB107 in La block

I'd also double check bearing clearances, most to rule out an issue there.
Dial indicator is the way to go for checking these types of numbers too. Like others have said, feeler gauge can be tough to get a good check with.
Also be sure to try and 'rock' the pistons a bit, or at least tap them lightly with a soft-faced hammer to make sure they're all rocked 'the same', since piston-to-bore clearance can let things move around a bit.
A dial indicator is good, but I prefer the depth micrometer. It can be much more accurate. It can also be used to measure positive deck clearance with one foot off of the piston head with feeler gauges between that foot and the deck. In that instance, feeler gauges are very accurate.