bbc sheet metal blower intake need help identifying

it has bbc spaced intake runners that measure 1.900by 2.900 it is for some sort of tall decl it needs a vally tray and will fit a 14/71 and it looks like the holes are set back I dont know what type it is but it is a sharp piece the intake flandges are approx 3/4 thick it could be a meirch not sure does anyone know how to Identify it there is no burst pnl in it whish makes me think it is old school any help would be great thanks CRAIG