Just go up from where your bolt is. If you have your kick panel off , just reach In And get it out. If it's spinning, it's broken off. Use a magnet it's a big chunk of metal. You could also weld a nut with a washer made into it from the bottom hole. Just make the hole a little bigger, and tap the nut I place, then weld around it . Very easy.
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018