It saves a ton of rotating weight in the engine. It isn't something to sweat if you keep the stock pin, which is somethign like 1.07

You might ask what it will cost to bush your stock rods to that size but don't spend a bunch to do so.

.990 is stock big block Chevy size, and those pins hold gobs of power. The Mopar pins were overkill, you know, normal for Mopar stuff of the day