the JDM ZC DOHC will bolt to 90 Civic DX, I was going to get the same motor for my 88 CRX DX you just need to convert to muiltipoint fuel injection b/c the DX has the crappy dual point FI. The DX tranny will work with this motor, but the SI will tranny will give faster acceleration. B)
Its a honda motor, so yes its good.