the 86-89 integra motor doesn't bolt into the 88-91 civic body.It's an 86 - 89 Integra motor. Not very desirable.
But you forget the people who tune these things charge for labor. Want me to dig up some $3500 and $4500 89-91 (stock motor) hatch ads on CL?a 90 hatch with a dohc zc motor is worth about 1000-1500
that's if it's clean with no body kit or anything like that.