I'm looking for a series 2A gearbox so i can mate it up to a 200tdi and fit it in to my series1 88inch please

id go for series 3, doubling the clutch gets harder with torque of tdi,most ive fitted tdis people hace gone for the all synchro later,series 2a isnt as strong as 3 as usually stated lay shaft is weaker ,1st gear is straight cut teeth which is weaker,preferably get any box done up brgs and 2nd/3rd bush and clearances reset