Rule for rubber end gaskets or bead of sealer is this: Lay the intake on the head block surface without a gasket. If it lays flat all around, use the supplied rubber seals. If it is tight on the block surface and raised on the heads you will need to use the sealer or mill the bottom of the intake. In this condition, the rubber gaskets will be squeezed out by the incorrect fit.
You say "it blows oil out of the engine going down the road" I take it you mean out of the seals and or gaskets. I'd warm it up and do a leakdown on it. JC