With that retainer off it should just slide out. Try some liquid wrench, and then clean around the edges(small flat screwdriver or equiv.). prying might bugger it up.
Mike
the Biggest difference was the motor. a special 302 short block with the use of 4V Cleveland heads and a special intake that helped to marry the Cleveland head to a non Cleveland block.
4-speed
Heavy duty suspension
and graphics
Hope that helps
Mike