My best answer, without stopping for a Ph.D. in history.
You might be better with a couple of entry level courses in the dismal science. Any economist will tell you that a tariff like the Morrill tariff is protectionist and is not designed to enhance revenue. Instead, it should discourage imports by making domestic products more cost effective. Revenue should remain about the same or go down because of it, not increase by a factor of 20. And economic boom or not, the only reason why imports should have gone through the roof is if the Northern states had had to replace products that they no longer got from the south. What might those have been, do you think?