What Sierra Parts?

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Thanks for the advice. Sounds like the LSD would definatly be worth getting then?
Im undecided on engine, I'm pretty sure I can pick up a 2WD donor car locally. I did have a look at a thread about someone wanting to use a 4x4. A friend of mine has 2 spare engines sat in his garage, got them as spares for his TVR and has said I can have one for a pint though I think a 4 pot would be my preffered engine.
I did think the 4x4s had some better running gear though so was curious to know if it was worth going up there and getting what I can. LSD has got to be worth it at least!
Do they have better brakes?