X2 with post 3.
Pull the valley pan off and only seal it with gray form-a- gasket.
Do not use a gasket!
I , as others have found that they never fit 100% right anyway!
Then get some some clay or aluminum foil, ball some up and sit it on the left and right side of the lip of the valley pan.
Next drop the intake on with no gasket and see if it still rest on the lip of the valley pan.
If it does then you know you you’ve got some trim grinding to do as posted above also.
Ideally you want a hair of clearance without the intake gasket in place unless you are using a thick Mr Gasket .050” type already.
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I do stuff for reasons.
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