Montek Singh Ahluwalia, deputy chairman, Planning Commission, today said investment in infrastructure will have to be about $350 billion in the next five years to propel overall growth of economy to over 8%.This chunk of the money would have to be in the form of FDI and private sector participation, Ahluwalia said at an Indo-US conference.Trying to allay overseas investors' apprehensions on hurdles in the country's growth, he said given the record and what the nation has achieved in the past, it would not be credible to say that it has failed.He said the government's efforts on inclusive growth should not be perceived as a dilution of the existing growth agenda.