Welcome to the site. Lets back up a little first. What symptoms induced you to have the injection pump rebuilt? I doubt you had this done on an engine that was running fine. All or any background information you can provide could help.

At your experience level either loaning or buying the fixture that locks down the tang. In the side of the injection pump should probably be purchased. I doubt it is that expensive. Do not get frustrated amy more than you already are as guys on this site can really help. In other words slow down a little until some things can be established.

As for your first question. You time the injection pump in depending on what system to do it you are using. One crankshaft degree setting is for when the locking tang fixture is used. The other when the drip method is used.

Of extreme importance the can timing marks must be fairly near each other. Or you have to turn the crankshaft 360 degrees or one full turn if they are not. The two lobes on the first cylinders camshaft will be pointing kind of upward not downward. Before really dealing with this the background information of what was going on is important.

It is a shame you have pulled the engine in frustration but understandable. To do away with one concern lets assume the injection pump was rebuilt properly for the time being. The tang you probably will be using is hidden behind a bolt on the side of the injection pump.You can look for a picture in the archives or perhaps a member will post one on your thread.