I presume that you mean a 1974 Series 3, not a Disco?
Most parts are interchangeable between a 2a and a 3 except obvious parts such as the dashboard. There are some differences such as the door checks that will require a bit of ingenuity to use, and watch out for changes in threads etc which will mean only complete assemblies can be swapped (e.g. hubs).
John


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Anyhow, simply put, yup pretty well most of it will swap about! Doors, bonnet, wing skins, door tops, rear tub, wheels, axles, ra ra ra.. The few differences as said before are:- lights in wings, synchro on 1st and 2nd in the Ser 3 (weaker gearbox). If it's a LWB, the Series 3 will have a Salisbury rear axle... Ideal for more power! Make one good one out of the two I say!!! Good luck!!

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