SCORE!
I'd buy an earlier model Explorer for about $700 and strip off everything usable. Swap all the 4X4 parts (fix the frame while yer stripping the BII down) Sell all the left over usable components on Craigslist, and pump that money into the BII as well. You have everything you need to make a great truck.
__OR__ Find another BII as well, cheap, and use the parts from the first, and the EXP to build a great truck. keep the first one for spare parts later.