First - I'd check to make sure the intake port isn't sucking oil from the valley due to bad intake gasket seal at the bottom of the port. I'd take the intake manifold off carefully and look to see if there is oil on the port floor. I'd then do the intake manifold angle match check following the Hughes procedure:
http://www.hughesengines.com/Upload/TechArticles/INTAKE_MANIFOLD_SEALINGJULY2015.pdf 1.5 quarts of oil in 126 miles seems to me like a lot to suck past the valve seals.
I don't think that I'd be starting over with a new head but if that's your preference, I'd be looking at the Eddy Head. I believe that you can run the Stage V SR head OTB but I'd send them to one of the head specialists that frequently post on this forum for checkout before I would bolt them on. I have CNC ported Stage V heads from MCH back when Jeff was running the show. They're great but I bought them before the Eddy Hemi Head came out. OTB, the Eddy head flows just about as much as my $CNC$ ported heads. And the Eddy's OTB are good in the street cam range (lift < .700). CNC Stage V #'s below are from the flowsheet I received with the heads. Eddy #'s are from
https://www.hotrod.com/articles/port-edelbrocks-hemi-head-38-cfm/_______-------- Intake ----------_________-------- Exhaust -------
_______MyCNC___Eddy___Eddy________MyCNC____Eddy____Eddy
Lift___StageV____OTB____Port+VJ______StageV____OTB____Port+VJ
______2.25"____2.32"____2.32"__________1.94"___1.94"____1.94"
.100____79_____No#_____No#___________67_____No#_____No#
.200___161_____166_____170*__________140_____134_____140
.300__*250_____238_____244___________184____*192_____211*
.400___323_____322_____327___________213____*232_____248*
.500___373____*386_____393*__________245____*257_____268*
.600___406____*410_____420*__________267_____269_____279*
.700___428_____419_____445*__________280_____272_____283
.800___440_____421_____459*__________281_____274_____288*
Sorry about all the "_"s but that's the only way I could force the column's to line up.
Asterisks near interesting numbers. StageV CFM were on a 4.320" bore. I didn't see a bore size mentioned for the Eddy flow testing. All testing was at 28". I'm at 604" with 4.500" bore and 4.75" stroke and you state that you are 540" with 4.350" and 4.5" stroke. 4.5" bore unshrouds the valve better. My motor has a 273/286 @050 .635" lift SR cam and made 888 HP at 6300 RPM with 824 Ft-Lb at 5000. I'm running dual FAST EZ-EFI throttle bodies on a Stage V Manifold. Not sure where the torque peak was since the dyno only recorded 5000-6700.
Picture is quick way to measure intake port size
Just my $0.02 ....
