1433 is the default SQL server Port for databases. In order to use another port to connect arcot to arcot database on SQL server, you need to change the PORT on the "SQL server Connection Manager".
1)Go to SQL server Connection Manager
2) Expand "SQL Server Network cONFIGURATION". Under here click "Protocols for MSSSQLSERVER.
3) A dialog box will open and here you can change the PORT.
4) After changing the POST in above steps, use this new port when installing arcot.