Gotchya. I will also add I am unsure if the bolt pattern on those early intakes is the same as the later Edelbrock style carburetors and I believe that's what that spacer is for. Maybe someone a little more in the know will chime in on that.
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.