I have done worse!...We will see?

Those are 8-3/4 gears for a 489 case. The ring gear says 39-11 meaning it's a 3.55 set. Not sure what the 9.75 means on thee pinion cause 9.75 was a Dana and that definitely ain't a Dana pin. Only problem is if their not a matched set you've got yourself a set of paper weights cause gear sets have to be lapped in together as a set or they won't mesh and will scream like a banshee and probably won't last long. Hopefully you just got real lucky cause 3.55 gear sets for a 489 case (their fine spline too which means their the strongest) are the most popular