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Got back to this project for a little bit today and learned some stuff….Knocking out that lower pin surely did allow me to remove the powerhead/seized driveshaft. Once off the exhaust housing, I learned the driveshaft was not seized to the crank! There is a roll pin just underneath the upper splines like on the 5.5-7.5hp models. There is a slot in the exhaust adapter plate like the slot found in the later 6hp models that requires the driveshaft be lined up correctly so the roll pin can slip down through the exhaust adapter. The powerhead was a bit stuck, but it freed up easily. So, this project can move forward….