I think KVMs landmark movies are :

1. Thiruvilayaadal
2. Thillana moganambal
3. Sankarabaranam
4. Vasantha maligai
5. Enipadigal
6. Navarathiri
7. Kungumam
8. Iruvar ullam
9. Vettaikaran

Yes, he is one of the giants of TFM

Somehow, in the late 70s, he faded from Tamil films. Atleast MSV could sustain up to 1980 before IR totally took charge