There is no production 3rd gen that comes with the 350 that has a manual tranny, gm found them to weak to handle the torque. The 305 TPI or TBI have an option for automatic or manual, along with the 2.8 v6. Although its not uncommon to find people who have swapped their auto for a manual in a 350.
Search Chevrolet Camaro Questions
Chevrolet Camaro Experts