Just a stab in the dark but lets see

3000 stripped clean, fresh painted shell
3500 fresh rebuild b16 with itr tranny(probably actually closer to 4500)

that is 6500 already. then throw in a couple thousand for the interior stuff, brake upgrades, body styling mods, etc.

I say it is a decent price and he may take less, who knows, no one has tried.
I have seen this car in person and it is very clean and most of this stuff on it hasn't been there for long.

Good luck with the sell man.