By It might be, Thanks J!
It is now rebuild time. hopefully get the car back in the parents garage next week so I can visit and start work.
In Engine news, plans for the tuned 2.0 B20 went out the window. It's an early car, so has a thinner transmission tunnel, which limits me on gearbox options. Also wanting to keep some of the originality about it I decided to stick with the 1.6 B16.
So these had about 60bhp. So to keep up with modern traffic I needed more power. So to keep within my rule of 'period' modifications, managed to source a Supercharger. Engine has been rebuilt and dynod, 110 bhp peak but more importantly 90-110 ft-lb torque straight across the rev range. So happy with that!