Head working and other camshafts

Hello, my tuner has suggested to me with a complete charging conversion with everything that also belongs to the cylinder head to be processed and to install other camshafts should give again n good performance plus! Now my question since the complete package is not exactly cheap I think about having the head and the cams to be done first in order not to have to pay everything at once. Does this from you and how much does this bring without any other changes? So I leave on Monday eh w egen Tüv to him but want to know your opinion and experiences!