71 plymouth

No way , My dad bought this in 1993 after my grandma passed , she left him $1500 , he waited to find a 1953 the year he was born and the first year of the F-100 series , And bought this , It was in okay shape back then and then it sat from 1994 until 2000 , then from then until 03 when i Really started working on it , Did a bunch of work , replaced fuel tank with poly tank

what exactly is a poly tank, ive heard about them but dont no what they are?