Thanks Leon for informing me about this thread. That is my old 1971 240z. I sold it to someone locally in March/April 2016 and had no idea he would flip it. Good to see it again across the pond.
To answer your questions:
1. It starts braking only when the brake pedal is fully engaged and the brake light signal on the Dashboard turn on.
I didn't have this issue during my ownership. However, I do remember the rear drums and shoes needs to be replaced. It is possible that the front calipers need replacement by now.
- The shift knob moves a lot from left to right, even if a gear is engaged.
Yes, that's a common issue with Datsun gearbox. Replace the bushing and that should solve the problem
- The car moves a little on the right when you drive on a straight line and the steering Wheel isn't centered at all (I hope this problem doesn't come from an accident).
This car has been in an accident by the previous owner, she rear-ended a truck in 1995/1996. Look closely at the strut tower bolts on both sides, it has been shaved so the bonnet can close without hitting the bolt. The bonnet and wings are not flush together due to the accident. Also, check behind the sugar scoops, there are signs of accident damage repair. The steering wasn't center when I owned it and I didn't get a chance to take it to an alignment before I sold it.
- When I change the gear, the car is shacken sometimes. Maybe the problem comes from the transmission or the rear of the car.
The rear struts are blown so the rear wheel smacks into the body when shifting. Fronts are probably blown too.
The engine is not original. The original engine threw a rod so I replaced it with a used L28 and I painted with chevy blue before installing into the car. The carbs were rebuilt by Bruce from Z Therapy so they work very well (I miss them).