Probably the best thing is to turn the steering wheel at a standstill, watching the front wheels for movement, preferably with two of you doing it so you can feel movement in the front wheels. You don't say what mileage your 4/4 is....mine is 7,500 and the steering is pretty direct.
If you aren't use to Morgans, certainly the steering feel can be somewhat different than a modern car with pas and modern front suspension, plus the fact that your are sitting pretty far back from the front wheels can give you a different sensation as well.
Turning to your final comment....I'd be tempted to take it to a Morgan specialist, Lifes is probably your nearest; they are generally pretty easy to work on as far as the engine, gearbox, rear suspension and brakes are concerned but most garages will never have seen a sliding pillar suspension before!
