engine code on top of the cam belt cover will tell you exactly what engine you have and with that its easy to know what bhp it is
you may also find the same code on the logbook/registration document
to confirm any 1.4 you may have
mk3 shape
AKK (08/99-05/02) 60hp
AUA (06/00-05/02) 75hp (16v)
AUB (07/00-05/02) 100hp (16v)
AUD (06/00-05/02) 60hp
mk4 shape
AMF (05/02-04/04) 75hp (3cyl)
AUB (09/01-05/02) 100hp (16v)
BBY (01/02-04/04) 75hp (16v)
BBZ (04/02-04/04) 100hp (16v)
BKY (05/04- ) 75hp (16v auto)
should cover it