Are these lifters compatible in a stock block?

I have never looked closely at a 273 solid lifter, so I am a bit leery here.
this is my first solid lifter build. I've had mixed luck with cams in the last few years. I think with the better understanding of oil supplements i have a better chance of success.
The wide open area in the middle has me worried though. these lifters by Howards look more conventional:



http://www.summitracing.com/parts/hrs-91718

The oil band is much thinner like a traditional Hydraulic lifter.
It seems like the wide gap in the Lunati lifter would allow the oil in the lifter gallery to pour right past and not even pressurize.