Most people in this section have fox bodies. The fox body bracket is like a puzzle you put together. The SN bracket is much simpler. there are 4 long 13mm bolts and two centering dowels that hold the compressor to the bracket. They go in from the side of the compressor. Just remove those bolts slide the compressor off the dowels, and zip tie the compressor up to keep it from putting strain on the ac hoses.
The lifters will come out with very little effort whether the head is there or not. Some heads have a low casting, and it is not possible to get the lifters out of the bore with the heads still on. It usually isn't a problem though.
If your heads have a receiver groove already cut in them, you are better off with an o-ring setup, like the lockwire gasket, or a permanent o-ring over the cometic gaskets. The cometics are not re usable.
Kurt