I agree that it is low probability that the intake manifold sealing has anything to do with my oil consumption - but now I am not sure what has been installed on my engine. The Edelbrock LB 351 4V has an exhaust crossover but the gasket they recommend, Fel Pro 1228 doesn't have exhaust crossover passage holes. If the manifold is installed with these gaskets there won't be any exhaust cross over and thus no reason to have a valley tray.
Since I can't see any evidence of gaskets being installed on mine, I don't know if a thin valley tray is installed or not. The exhaust cross over will also be open unless it has been somehow blocked. I may pull it just to find what exists.
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