The peculiarities of using Type2/Type3 Conditionals with regard to the shifting of tenses

When making out sentences in narration of the past time events and implementing the Conditional Mood, shall the time shift principles be observed? For example:

1. [conveying the idea of unreal condition tallying with the author’s time or the future from that point of vew] "Looking at him I knew that he would do the job well if he could have the opportunity of arriving next week". Or should it be the forms of Type3 Conditional in any case because the situation unwinds in the past as to the reader’s time (i.e."Looking at him I knew that he would have done the job well if he could have had the opportunity of arriving next week"?
2. [conveying the idea of unreal condition situation unwinding before the author’s time] "Looking at him I knew that he would have done the job well if he could have had the opportunity of arriving a week before".