Unless the '35 is different in a big way from the 216 in my '52, then it's gotta have a seal back there. What's gonna keep the oil from coming out?
If you have a gasket kit, check and see if you can find two pieces of wick (they call it "rope") about the size of a pencil. One piece fits in a groove in the top, up in the engine block, and the other is for the main bearing cap.
It still might leak a tiny bit with the rope seal, but it certainly shouldn't gush out. I'd say a drop or two every time you shut her down is pretty normal. Look for an old timer who's an expert with 216 if you want ZERO leak with the rope seal, because it takes some skill to make it totally leakproof.
