1st of all, you wont be able to use the LSx compressor unless you are planning on cutting the frame some. You can use Kwickperformances high mount for a Sanden compressor.
Mounts: If it were me, I would spend the $ on ECE mounts, from what I understand you can use stock Trailblazer SS manifolds with them, otherwise you will need to use POL (
http://www.performanceonline.com/sto...cat=455&page=1) mounts, this is what I used, they work really well putting the motor up about 1" so headers will fit, but the stock manifolds wont and fbody mounts wont either. Hope this helps.