Thats a brutal run with lots of shoals in those back bay channels. I lived in Ocean City for 18 years. Not sure about the bridge on 34th street there. I have done the ICW from Barneget a lot when I kept my boat in Toms River for a few years. Manesquan to Barnegat is easy except for the current in the canal and a few openoing railroad bridges.
Only one bridge between Barneget and Atlantic City, but the stretch from the Great Bay to the casinos is winding with lots of very very skinny water.
The ICW from AC to Cape may is a pain in the ass. I say take the outside route its only 26 miles and two of the three best inlets to travese in New Jersey, Absecon and Cape May. You will travel a lot further than 26 miles as the ICW really winds a lot and like I said has tidal current to boot with soals.