Finally goy under the bonnet today and tinkered and found out why it was slow to wind over - stuffed starter :)
The starter is undone but I gotta pull the oil filter off to pull it out, I will then see if I can fix it as it is different to the 300zx starter.
While I was under it I also noticed that it has aftermarket torsion bars so I am going to have a good look over the suspension for other goodies.