Whereabouts are you test driving the '44 out? If near Warwick I could give you a hand.
Check the sills out carefully. They should have some factory looking underseal under them, in addition to a divot in the middle of the sill telling you where to jack the car up from. If it's not there the sill has seen paint and possibly bodged. Also feel for rot around the back of the wheelarch inside. Any step there or crumbling, walk away from the car. You can also check the sills by looking into them via an aperture in the B post where you can shine a light down it (plastic piece is easily removed).
Feel for backlash in the car. A little can be ok, but it's a fair bit it could be CV joints which aren't too tricky to change or it could be the clutch where you are looking at big money for putting it right.
Rust around the wheelarches on the wings is normal to a degree, just make sure it is barely surface and that's it (later cars had shields put in which promoted rust there).
Besides that, check out for the usual (play in the steering wheel etc.).
But as said the best thing to do is to come along to a club night. I think it's held on the Second Tuesday or Wednesday of every month at the Red Lion.
BTW you may end up preferring driving your 924...

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