I used to rebuild quite a few of them when I worked at Austin-Healey West. Success rate was something dismal, like 7 out of 10.
I suppose it's always worth an attempt, risking the loss of what the rebuild kit costs these days (?), but my recommendation would be to buy a newly manufactured replacement.
I'd forgo the original looks in favor of safety, but that's just me.
Edit: 70% success rate, not 30%!