I agree with what others have said. Looks like these are added oil supply lines to the rockers and valves. You need to see if other modifications have been made under those valve covers. I the hoses are just dumping oil into the top of the heads, I would remove this modification as it is also robbing the rest of the engine of oil pressure. I would like to see some pics under the valve covers.

There is an article on the net on how to modify your rocker shafts for positive oiling. After more investigation of your engine you may want to make those mods.

Good luck