Which spacer for 1965 273

Stumpy said
It currently has a circa late 90s 1405 which fits without the spacer. I’m replacing it with the electric choke 1403. I figured I might as well put a spacer on when I’m doing the swap.

Ok, well you just answered THAT question! That spacer should work then. Although, I prefer the thick black insulating gasket......but whatever works!