3.0 /6 in storage the case is filing with oil, and starting to leak on the floor. Options

[Mark Henry]

So my '74 /6 conversion with the DWD sump tank is slowly leaking down into the engine sump. I have a leaking #6 rocker shaft that I'll have to R&R so I know my engine is full to at least to the exhaust rockers. I know it doesn't drain enough to do this if I drive at least weekly. I have a buddy who's well worn engine has hydrolocked a few times due to this.
I had to start and move the car, quite the smoke show.

Only automatic cure I've seen so far is a $300 valve from Rothsport. Or I could just install a ball valve and red tag my dash for just over $20.

I know it's a common 911 issue, do you other /6 owners have this issue and what do you do about it?

[injunmort]

had this problem on my nortons and indian. they sit, oil runs into the crankcase. I have seen bsa owners put in valve or ball checks, I have also seen what happens when you forget to turn the valve on or the check ball fails. I am good with drip pans and emptying the crank case upon start up. if it sat long enough for oil to drain into case, it will probably need other fettling as well.