Am I ok with this? KB107 in La block

I doubt they earmarked a particular block for a particular car. The logistics or that would be a nightmare at an assembly line. It seems to me, the next block in line would get the numbers stamped into it for the next vehicle. It would hard enough to keep track of HP engines vs standard engines let alone trying to match perfect specs to certain vehicles and not others.

Makes sense, I was thinking more though that the blocks that happened to be closer to ideal spec after machining were selected for higher-end makes. I don't know much about the manufacturing and assembly side of things back at that time though so would that also have been asking too much? I'm pretty sure I read that Imperials at least were built to a much higher quality standard than the other makes and I assume that pertained to engines as well.