Find where the air intake is and oil it there. Have fun getting to it. You might as well take it out and disassemble it. Do a search. There are several posts about it and differing opinions on what is the best lube.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.