Dom,
you wanted to know about what parts might be missing/incorrect on the car, the pics have helped:
Dash: the ammeter is non sunbeam, water temp gauge is off a later alpine/tiger, the clock is a later alpine/tiger unit, the large warning light is where the cigar lighter or blanking plate should be, the blanking plate for the alpine choke hole is filled with a switch (the middle of the 3 switches) The steering wheel and boss are non sunbeam.
Engine bay: non original air cleaner, manifold, oil breather cap, engine fan, alternator, oil filter location, distributor.
The shifter appears to be a hurst aftermarket item.
On the exterior the side trim is missing, the bonnet scoop and hood pins are obviously non original, the reversing light a similar to the original optional WIPAC units, but they are not the correct ones.
obviously things like the door trims etc are missing, but thought some of the detail stuff might help.
On the things like the clock, manifold and carb etc, they are not parts that are negatives, so don't throw them away. The correct clocks are very hard to get, and its possible this one may have been fitted at a dealer a few years after purchase, the temp gauge would be easy to get as would the ammeter, though your current setup when working probably puts out more than 30.
Looks like a good project car
are