ZL1/L88 198 intake, NOS 074 heads

[webco 1]

I could see that . You never know what kind of mistakes they made from factory. Not everything came out the way it should have. I am wondering if they were only cast like this in 1968. Have not seen any other 1968 "042" heads and the build date of the engine is august 19, 1968 so it could deffinately be july 11, 1968. Would just like to make sure before I reinstall heads on original block. The owner believes they are original heads but they are on a LU suffix block whick is 435hp, tri power, heavy duty clutch 4spd. And to my understanding, they only used 042 heads on l88 and zl1 engines. He also has an original ZL1 engine and it has the 042 heads dated 2.2.69 which are the original heads.