4 Speed Hole Help

If you have the sheetmetal hump in hand, that would help immensely. If someone could get you a dimension from the floor board/firewall back to the center, that would be a start. (I only have experience w/ 67-69's.) Then place the hump on the floor and trace the outline. Cut inboard of the line approximately 1/2-1". The hole does NOT meet the hump walls line-to-line. There definitely was a lip where the floor extends past the vertical walls of the hump. They were not completely welded around the whole circumference, just short welds spaced around the edge. Then it was slathered with that heavy seam sealer. This is how to get a factory look but you can make adjustments as you want.