I know a little. I was actually at the site about 25 years ago. Friends had a plane there. The day I was there, there was still remnants of a cinder block bleacher there. When I asked my buddy (funny, his name is Buddy) he then explained that this was where the race track used to be in the 50's.
I know Smokey Dengler has a win there. I believe Carl Van Horn has at least 1 win there. I once asked him if he remembers racing there & of course, he did remember.
I can't think of his name right now but one of the flagmen had a son who was a corner flagger at Reading in the mid 70's.