I do agree the King bearings are very good, however, I didn't feel it was ncessary to spend the extra money for them in a street engine. True if everything is machined correctly, there is no fitting the bearings, However, When bulding a preformance engine for street or track, our clearances become more important. Putting a set of rod bearings into a rod and torking them to specs and checking the bore dia. will give you the information for the crank grinder to gove you the clearance you want. Same for the mains. I like .0025, It's worked for me for many years
Now Florters are another story!!!
Gramps