My engine has a light knock when cold. I am assuming its done and want an ls engine now. I want to keep ac but I see the cross member has to be notched. so how about an electric ac compressor. yes I realize that will be harder on the electrical system but are there any options for this? Or would it be better to get out the side grinder? is there a remote possibility it would be less drag on the engine while it is on. ya know no actual compressor drag just alternator drag.