need opinions here

2 things, I have had 3 s-10 vehicle, from 2.8 to 4.3, Right now I have an 88 4x4 s-10 Blazer, do all of the a/c compressors make so much noise and vibration, or is there a problem here. or an upgrade. #2 I have heard mixed opinions about the torque keys for raising vehicle ride heights, I want maybe 2", is the torque keys a bad idea, feedback please.

You can't have the same thread in two locations. Use the original in the Blazer section.