So,
What you should do is buy a 1997-1999 Rav-4 for about 4k in decent shape and use that as a daily driver. Then look for 2001 troopers or Acura SLXs on CL and the like that are around 1k-2k. Use their engine and part out the rest to recoup the cost.
Sell the Rav-4 for about 4k (because Toyotas retain their values very very well).

I can't see the logic in installing a brand new engine in a 10 year old car, especially since even the new engine will leave you with the same "will I suddenly run dry of oil" feeling as the original one. It seems like your issue wasn't oil related, but it is something that worries every VX driver.

OR: 6K buys you a used VX. Part it out but keep the engine, reduce your loss that way.