Troublesome Oil Leak

I am thinking it may be the China walls. I tried the dye out to help me find the leak and it seems like there's a small one in the front corner where the pax side head meets the intake, and then the back seems to be leaking all along where the intake seals against the china wall. I thought I was pretty generous enough with the grey RTV gasket maker when I was assembling this thing. May need to try degreasing better or something when I redo it. Rear main does not seem to be leaking at least. I'm hoping the head gaskets are not a problem and it's just the intake. Thoughts?

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I found the grey rtv doesent really set up hard like other sealants. I bought it because there was no ultra black on shelf.

i had a 318 poly that would not stop leaking at back china wall. I put shop vac on crankcase vent and put sealant across the outside. I cleaned it first.
That finally sealed it.