I'd try a shot of compressed air to see if it might dislodge it and move it to a position I could reach with a magnet or other device. You could try this through the drain holes down by the pinch welds.
'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60 '57 Belvedere 2dr sedan, current project in process '19 Cherokee Trail Hawk Elite '03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
