OUCH!!!
Now you have your work cut out for you
You have to remove and inspect the oil pan, check the oil pump pickup tube, remove the timing chain cover, and inspect the oil pump to see if its seize.
While you are there replace the timing chain, both sprockets, tensioner, and front seal. You really don't need a high volume oil pump, the one that came the engine works just as good.
When all is assemble, whether you pack Vaseline in the oil pump housing or get a primer tool you still need a oil pressure gauge to see if you got oil pressure before you start the engine. If you don't know this part read this:
http://www.gnttype.org/techarea/engine/tchain.html
I almost forgot, check prices for cam sensor replacement, they are expensive.
Keep us posted for your findings