I have a 69 Chevelle but I need a new rearend and quick. I found a 67 Chevelle (wagaon) that has a rearend. Will this fit e.g. Pinion Angle, Mounts, & Spring Pockets? I want to change this rearend this weekend.

Is it a drop-in - NO, narrower than a 69. Can it be made to fit - depends.

Dave:
I had a rearend from a 66 or 67 ElCamino in my 68 Chevelle car. It was about 1"' narrower than my 68 but it bolts right in. If you have enough clearance on the backside of your tires it should be fine.
GaryR