The
oil pan (leading edge centered between the front tires) typically clears a bit better than the Bellhousing flange which is aft of the tire and usually hits after the front tires have cleared.
Some folks have the Bellhousing lower flange trimmed.
On my car the Canton pan and the (untrimmed) Bellhousing flange are at the same height.
I do have my front springs adjusted so the fender is Two finger 1st knuckle above the tire. This gives me a full 3.5" clearance. But I do not cross speed bumps. Those are off my list at all cost.