For continuous running you will somehow have to deal with valve train lubrication.
Also, oil filtration may allow for longer oil change intervals.
Combine the solutions...
Consider this idea for continuous long runs with a 6/1 CS style.
It is something I am considering for my Listeroid.
-Replace the oil drain plug with a TEE fitting.
one port on the tee is for draining
one port on the tee is to connect a very small gear pump
-Draw oil from the sump with a small gear pump and pass it through an oil filter
From the filter you can branch to several locations in order to get the oil back to the sump.
1] The camshaft oiling plug near the decompression lever (this will solve any cam bearing lube issues)
2] If you want to include the valve as well, use a tube up to the valve assembly to trickle over the rockers and valves.
To drain the valve area you drill/tap a drain hole in the side of the cast iron ledge surrounding the valve chamber.
From there it can drain back to the camshaft lubrication plug by the decompression lever.
Obviously the flow must be very low, so a tiny gear pump is needed. (Or a larger gear pump with a bypass line taking the majority of the oil directly back to the sump while some oil goes to lubricate the valve system.
This is an old video but it does show a small gear pump running off my auxiliary crank pulley.
From the gear pump the oil passes through the filter and back into the sump. (I vented the crankcase elsewhere with a check valve).
Further modification to this system would be to TEE a connection before the oil goes back into the crankcase and divert some up to the valves.
Then have it drain into the camshaft lube port discussed above.
https://www.youtube.com/watch?v=l562wUof59cThe vid is a bit lengthy but you can jump to the 0:30 second mark to see the lube system.good luck with your project,
veggie