If I remember right, Inchgreen Street started just west of the Drydock entrance and continued until it reached Port Glasgow where it became Ardgowan Street, roughly across from the drydock entrance was a garage, if you look at the photo on the Watt Museum site (see the link I posted on the other post about Ladyburn Buildings) , there was possibility another side street to the south before Inchgreen Street reached Port Glasgow, roughly at the main works entrance to Anaplast, following that was Boundary Street which was opposite the Sanmina factory in the present estate.
