Rubuta ci gaba ga wannan sakin layi - A Wasannin Afirka na 1973
a Legas, Nwankpa ya halarci gasar masu nauyin nauyi. Ya lashe lambar zinare, inda ya doke Issake Dabore na Nijar a wasan karshe. Ya kuma lashe lambar zinare a cikin rukunin nauyi mai nauyi a Wasannin Commonwealth na 1974 na Burtaniya, inda ya kayar da Anthony Martey na Ghana a wasan karshe.