how much is my car worth

I recently bought a 1999 mitsubishi 3000gt. One
owner with 93000 miles. Great bright red paint job
runs great everything works on it. The only thing I
had to replace was the tires because they were dry
rotted  and I'm fixing to have the  timing belt
replaced because everyone  I talk to says at 80 or
90,000 miles it should be replaced.
My only issue is that it is a 5 speed. I'm trying very
hard to learn but if I decide it's best for me to have
an automatic and sale this beautiful eye catcher
what should I ask for it? I'm scared I'm going to be
in the hole.