Todd,
On a 77 frame I have 3.75" from bottom of frame rail to centerline of hole.
On a 68-69 ? front frame that I now use as an engine dolly, (Rear frame went to a trailer build). it still has the original tracbar mount but has aftermarket extension on it. I still see the existing hole, it is 1.75" from bottom of frame to center line of hole.
I can't say how much outboard it is but I'll try and get pics for you.
madgyver