Edelbrock Air Gap

[rumblefish360]

A 1 inch open spacer.

 

[68 Coronet RT]

A 1 inch open spacer.

The one I ended up ordering from Edelbrock is the 4 hole laminate 1/2 inch spacer

 

[BigBlockMopar]

I've learned 4-holed spacers usually give better throttle response on an open single plane intake.
Especially with Edelbrock/Carter carburators. They like the 'extra/clearer' vacuum signal from the engine.

 

[rigger3006]

i milled mine down 3/4 inch, i feel it added low end torque, have a super sucker 4 hole on the way from summit, will see if that adds anything