I performed export/import from 7.3.3 to 8.i.7.0 database.
It went good but feel that ther were some grants on certain on dba_tables and role_privs table which are not in effect in new database 8i7. Due to which when than the user who is suppose to run a sql select on the dba_role_privs table is not able to do that in oracle 8i7 while same user can select on dba...view on 7.3.3 database.