Help With A rad PLEASE!!!!!

3443975 is a body 340 standard cooling auto and manual 2 core
3443976 is a body 340 N95 HD cooling or with a/c auto/manual 3 core
3443977 is a body 318 with A/C

i've never seen a 71 340 with a 977 all i have ever seen is mostly 975 or the rare 3 core 976 max cooling in a 340. this is what my service manual says . it should take the 2998325 shroud