Ray.....see old map below......"NEW EXIT" is the tee junction at the top of the current entry road just after the toll booths.
That intersection is center left in the picture......the current camp ground is under the trees left of that again.
Photo taken from the access road after the turn 4 bridge (not there at the time of course).

BTW.....pic3 is a continuation to the left of pic2 .......those 2 pictures are the "Laguna Seca" (Spanish for Dry Lake)
Scrutineering and paddock parking/pit allocation is done on that dry lake bed to this day.

Jim Grant