Todd and Autumn,
Knowing this engine experience has been painful and expensive for you folks. Stout hearts and you can overcome this.
You made commented that everything checked out as OK and I assume within specs. Since the oil filter flow capacity has been addressed, how about this little detail to consider. What are the bearing clearances vs the SAE wt of the oil you have been using? Some folks swear by the water type viscosity oils, but if the clearance is large, they can't maintain an adequate hydrodynamic wedge and will skin the bearings up every time.
Hope it proves to be something simple like described above and that you can solve it and get to dyno time and racing soon.
Best of Luck to you both.
Regards,
HB2
Dissident