Thanks for the info. I didn't know about the spacer, but that makes sense. Did the bores taper down to match the holes in the intake, or where they straight through and just there to clear the carb butterflies. I had one of the 273 AFBs and intake about 25 years ago, but can't remember much about it. I put the chrome air cleaner top on my 225 Barracuda coupe and somebody bought the car before I swapped the a/c tops back.