rocker shafts installed backwards... long read. but pics!

For a mild engine like this, having the shafts upside down will have no long term problem. It just means on initial start up, the oil now has to fill the shafts to the top so that the oil can exit the shaft holes. This will happen veeeeery quickly as without the holes being at the bottom of the shafts, there is no leakage occurring & the shafts will fill quickly.
Drive & enjoy.