You could try
With Chevy the letters/numbers after the name is option packages.. SS, LT, Z28, etc Like mentioned already the Chevelle is the base line car... Chevelle maibu is an option/trim package.. Nicer looking interior, better engine, better options like radi...
Are you talking about two totally stock cars? Is the Camaro a V6 "base" model or a Z28 or an "SS"? More details please. BTW, the GTA will probably outrun the V6 Camaro but won't stand a chance against the Z28 or the SS.