Hey Paul.
Please clarify your route. Will you take the Blanc-Sablon to Ste Barbe ferry to NFLD? And when you leave will you take the Port-aux Basque to North Sydney ferry, or the one from Argentia to North Sydney?
I have never been on the roads along the north shore of the St Lawrence, so I can't help there. It has been 5 years since we drove from Port-aux Basque to St John's, and the road was just like any other--in good shape.
The Port-aux Basque ferry was a nice trip in good weather, but when it gets stormy, the seas can be on the large side. I understand that the other route from Argentia can be more bumpy than the other. Take some Gravol with you for sure if you are prone to sea sickness.
Beware of the winds in the Wreckhouse area north of Port-aux-Basque. Click
here for the hourly weather forecast. FYI, truckers have a healthy respect for the winds here and rightly so. Click
here for more info.
The "Rock" is awesome!