340 crank- standard or reverse rotation?

Hi, I was told that this 340 crankshaft was a reverse rotation one and was wondering if anyone could help me figure out if it is or not. I've read that the only way to tell is by looking at the direction of the oil guides for the rear main seal, I posted a picture of them. The crankshaft also has some markings that say "R2 R3 R4", I'm thinking maybe the R stands for reverse? Any help would be appreciated
-Leandra