Yikes , thats a lot of oil , holy smokes , no pun

You shouldn’t have to cut the intake manifold if your block and heads where not cut

Did you use any gaskets with your tin valley pan , or install dry only ?



First with that RPM intake - Did you dry fit it on the heads with no tin valley pan in place and make sure it’s sitting completely flush with head surfaces

That’s where I measure with alignment of bolt holes , use your thinnest feeler gauge on the top and bottom of intake in all four corners using different spots between the intake mating surface and heads to see if any areas the feeler gauge will slide in - It shouldn’t - I had a .008 and .006 feeler gauge



Then resting dry on top with the tin valley pan and hold down bars in place , make sure the intake isn’t resting or hitting the corners of the hold down bars

A lot of guys had fitment issues with the intake manifold hitting on the corners of the valley pan hold down bars and had to grind the corners of the intake manifold

Start there first