i wouldn't offer anything over book value, its 97 with lots of miles, people need to learn if you mod it, your not getting any of the money that you put into it back on a resale. at least not from me
if you mod it, you did because you wanted it that way, and buying someone else's modded car could be a time bomb waiting to go off, i'd pass, but that's me.
always buy a stock car and work it up yourself!
so build you own car when you can.