Sir,
1st thing... If the belated return was not filed till 1 year after the end of relevant A.Y ... the assessee can no longer file the return...
Secondly,... if the assessee has not purchased another house withing the due date of filing return, he has to deposit the amount of capital gain in a separate capital gain bank a/c maintained for this purpose to avail benefit of sec 54 .... In case he has not fulfilled the requirement , he can no longer avail such benefit..
3rdly.. no benefit on purchase of car....