The following is a link to a page at the Naval Histirical Center which has photos of a model of the Pennsylvania:
This information is from America's Line of Battle by TD Shiflett:
The ship was authorized as a 74, but was pierced for 132 guns.
In 1842 her armament was 90x32 pdrs and 12x8" shell guns, a total of 102.
In 1846 her armament was listed as 2x9 pdrs and 1xsmall brass swivel on the spar deck, 4x8" chambered cannons and 32x32 pdrs on the main deck, 4x8" chambered cannons and 30x32 pdrs on the middle deck, 4x8" chambered cannons and 28x32 pdrs on the lower deck, a total of 105. Of these, only the cannon on the spar deck would be visible on a model and require rigging. Apparently the ship was never equipped with guns for all her gun ports and never carried more than a few exposed on the spar deck. She also didn't have much of a career as she was commissioned in 1837, placed in ordinary in 1838, and became a depot ship at Norfolk in 1842, where she was burned in 1861.