Prices can vary widely, and the market for an FJ80, with its pitiful mileage (I had one...) will make it tough now-a-days. The mileage is a real bonus on that one, though...I'd think around $2,500 to $3,500, maybe up to $5,000 if you found someone who wasn't really familiar with the model. The 3FE is a great motor, but most folks in the market are looking for the 1993+ models with the 1FZE.
HTH
-H-