I have a 68 Camaro with ZZ3 350 and the manifold was on the car when I bought it. I have vortec 58cc aluminum heads. It has a Carter AFB carb. The manifold has a snowflake casting near the water neck and looks like a GM high rise. Can anyone tell me what it is and what it compares to?

The snowflake means you have a authentic factory aluminum intake made by "Winters", an aluminum foundry in Ohio.
Rhat

What is the casting number on the manifold??

The casting number is 14044836.
Thanks,
Dave