First, if this is any sort of a performance application, forget about the anti-drainback filters, they WILL cause issues. I have personally A-B-A tested them in my +/-375 HP small block in my `83 Malibu wagon test mule which is equipped with a `77 Qjet (uses the long paper filter).
Standard filter = 0 issues.
Swapped in an anti-drainback filter, took it for a test hit--top of 1st and into 2nd it started burping & farting something awful, abandoned the run. Repeated a couple more times with the exact same results.
Brought it back home, stuck the standard filter back in and presto, the car's right back to normal, no more burping & farting.
Second--for the most part, the issue of QJets going dry in a few days is vastly
for the most part due to simple evaporation, not draining through the bowl (esp. on later model QJets or earlier units which have been properly sealed). The QJet on my wagon goes dry in 3-4 days, and it's properly sealed up.
Keep in mind a QJet holds maybe 1/2 the fuel volume of a Holley or Carter, so they'll evaporate out more quickly. I have also verified that regular pump fuel will evaporate out of a Holley in a week or so (verified both on my wagon and on my Chevelle), while the 100LL Avgas I normally use in my Chevelle is good for weeks.
Lastly, I have verified rapid evaporation from the 3 gallon fuel cell I use on my carb live test engine stand. With an open vent on the cell, I can see the pump fuel evaporating out of the cell on a daily basis.
$.02 worth from someone who builds carbs for a living.