Which one and why?

well Charlie, gotta wait for it to come back from machine shop, to see that....it's in for either a polish or a turn down (not sure what they are gonna need to do to it) the knurling, was the reason I was questioning which way to go.
I might get ahold of you or Dad Truck (that's his name on the other site, he's in this thread above) if it has a heavy knurl to it.... I only wanna put ONE rear main in this engine! Not a redo once it's right side up and bolted in..... I dunno where my "Sneaky Pete" rear main seal tool is these days/ and not inclined to go digging for it, haha