Belated return - heavy tax liability

 Mr.X is instructed (oral) by  "AO" to pay heavy tax

Fact of Case,

1. Mr. X files ROI  only under HUF  status  from several years

2.AO issued notice U/s 143(2) for the Asst.Year 2008-09

I Plan to 

1.File Mr. X Individual Status return  from Asst.Year 2006-07  to 2008-09 in order to create cash sources and transfer       funds from Individual to HUF status ,

Now, My questions are 

1. can   his individual returns for the Asst.Years 2006-07 to 2008-09 be filed now, 

2.Can the HUF status returns for the  Asst.Years 2006-07 to 2008-09 be revised now