1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
Factory style or header type. 1969 was the only year side pipes were offered from the factory on C3 bodies and they are available in reproduction., Not cheap but look right on any C3. They only list them for fitment up to 1974 due to the cat converter starting in 75. That's no biggy since that will go away anyhow. They fit up to 82 but you need to be sure you have the right manifolds; 2 or 2.5 inch outlet.
The header type is widely available even on Summit and Jegs. Here are the stainless ones but they are also available in steel and ceramic coated steel. Side pipes are sold separately. Some Corvette parts houses offer them in a complete kit.