416 oil leak

I have a 340 stroked to 416.Engine was dynoed no oil leaks.Oil pressure around 60 psi while driving -20 psi at idle.Engine does not leak oil unless i run it hard.It will have oil laying on top of timing cover and down back of block after i get in to it.Have pcv valve on left side and breather on valve cover on right side.Does have baffles under the breather and pcv valve.Motor has good vac.I did remove intake and had it cleaned.Could it be coming from the front and back of intake.I used sealant instead of gaskets in front and back.Could i be leaking oil around intake and not have vac problem