Alot of this is covered in the Sticky so you might want to read through it again but here is my take:

You could probably fab up a pipe and use the DSM BOV but the stock 3sgte BOV valve is the best one you can get. You can usually find one used for $25-50 here on the board in the for sale forum. Make sure you get the BPV valve with it.

Don't know about the SAFC2.

The wastegate actuator needs one line connected to a manifold boost source and the other plugged. Again check the sticky. The BOV and BPV also need a boost source from the manifold as does an MSD-BTM if you are using one of those. It explains in the sticky which ports would be best to connect to. Avoid the ones that are used for EGR because they will sometimes have vacuum even when you have boost in the manifold.

There have been a few discussions on here about how to keep vacuum on the crankcase and keep it from smoking at idle which will happen if you just vent to atmosphere. My prefered method is to keep the two stock hoses that go from the intake manifold to the valve cover where they are but add PCV valves to both of them. A 93+ will have a PCV on one of them already. I haven't had a chance to extensively test this yet but it worked for a couple of days for me.

The boost gauge can be connected to either of the locations you mentioned just follow what it says in the sticky and avoid the EGR ports. I found that there were enough unused ports on the manifold that I only had to use one T to hook it all up.

 

as for the oilpan return you can just get a piece of pipe welded onto the pan at the right location and get a drill bit the same size as the opening and drill right through the pan......presto...a oil return nipple