I kinda saw this coming.....haven't seen you post as much lately.....I personally would keep it. My plan, should things work out that is, is to purchase a Newer Gen Taco, use it as my DD, and keeping the 4Runner as my Sunday Cruiser / Summer Vehicle.
However, I too don't have much room in the yard to store it, so don't really know how I'm going to pull that off, without parking one of the vehicles on the street. In the winter months, I might just park it at my Dad's place....he's got a 64 acre farm.....
You've got quite a good amound of money invested into the truck, and eventhough it needs engine work, it can still be a very reliable vehicle once it's repaired.....
Good luck with your decision man........