I found one!

CP@ congrats on the boat, I saw one the other day at Brannan Ilsland and talked to the guys using it, they said the owner of the boat never took it out, so they used it all the time. Kinda sad the shape it was in, but at least it was being used instead of sitting.

I have a 79 with the 305 motor as well, got it about 4 months ago and simply love it.