if it comes down to money and your carb is more knackered than in need of tuning then you have various options;
rebuild the pierburg, should be better once rebuilt, they have a bad reputation simply because the carb is 20 years old and in a poor state of repair.
buy a 32/34 dtml weber jetted suit your 1.3. new this will cost a few hundred quid.
buy a 2nd hand webber, this will cost maybe a £100 and may need reconditioning if your unlucky.
Jason - 07767878755, he did have some spare carbs not long ago.