I've started digging through my old slides and negatives ... I do have a lot of stuff on this Datsun. I've ordered a proper scanner so I can load digitize and share these photos. In the mean time, I've found a couple Youtube vids you might enjoy.

The first is from a track I raced on a bit back in the day, Bridgehampton. This is an SCCA (Sports Car Club of America) event with it's various races for its various classes. The PLN and the Bob sharp Datsun appears toward the end of the vid, racing against a Mazda RX7 and a TR8 (I think) with the roof cut off. https://www.youtube.com/watch?v=SQDSmvPbcKE

You might also enjoy this vid of the 1978 SCCA National Run offs. Sam Posey does a very nice job explaining things. https://www.youtube.com/watch?v=LruOfTlZhAQ