In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Ifton like this:
IFTON, a parish in Chepstow district, Monmouth; on the South Wales rail ay, adjacent to the Severn, 2 miles NE of Portskewet-Junction r. station, and 3 SW of Chepstow. Post town, Chepstow. Acres, 1, 155; of which 495 are water. Real property, with Roggiett, £3, 058. Pop., 20. Houses, 4. The living is a rectory, annexed to the rectory of Roggiett, in the diocese of Llandaff. There is no church.
GB Historical GIS / University of Portsmouth, History of Ifton in Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 26th April 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Ifton ".