Is a carb spacer the answer to this?

Mopar Performance had at one time 1/4" gaskets to use as spacers, when you didn't want a lot, looks like a good fix for this. Could find one in the new MP catalog

couple of sites
http://www.racecarproducts.com/carb_spacers.htm

http://www.cantonracingproducts.com/phenolic/spacers.html