The Tirupati Balaji Temple in Guwahati was inaugurated as recently as 1998, near ISBT on NH 37 and just before Maniram Dewan Trade Centre.
The Temple is open from 8am to 1pm and then from 3:30pm to 8pm. Video recording is completely prohibited inside the complex and only photography of the buildings, gardens and complexes is permitted. Photography of the idols is strictly prohibited.
This is not one of the historic temples around Guwahati, but you could include it in your itinerary.