Pinion angle - have a vibration

I know there has been posts of this before, but I never see the actual numbers. I have had a high speed vibration for years. I have had the driveshaft balanced many times. Checked all the usual suspects. I started to wonder about my pinion angle. On the hoist it looks good, but I never checked on the ground. That was a "duh" moment. My buddy Tom has an angle gauge and we checked. The pinion angle is 3 degrees and the transmission angle is 2 degrees, all while flat on the ground. I would have to believe these numbers are very good, but I don't know exactly what they should be. Anyone able to help out here and give me an idea of where I should be? Oh yeah - small block 408, 200R4 transmission and Dana 60. I also have Caltracs and Calvert Racing mono leafs.