Leakdown test on rebuilt engine

OK so I noticed a slight "hiss" when I was using air psi to hold valves up when installing inner springs. I thought I better check with a home made leakdown tester.
#1 TDC compression and 60 psi, I can hear "leak" at oil fill. So that indicates rings, which are new. Now this engine(340) has only seen runstand time, and I'm assuming the rings aren't broken in yet?
I'm "ready" to start installing this engine but wanted to be sure. On breakin I noticed no blow by and 80 psi.
Tots/advice?
Thanks
Steve