Thermoquad on Edelbrock RPM Airgap

Ok. I did find a couple spread bore spacers, not adaptors.

Another random question... any difference between an open spacer or a 4 hole spacer?
In general a 4 hole spacer adds torque a d a open spacer adds HP.
I do not think you will find a 4 hole TQ spacer or adapter.

Also, Mopar Muscle had an article that used a performer RPM (non Airgap).... if the car is summer driver only, street/strip, then they highly recommend blocking off the heat crossover ports. this would help keep some direct heat away from the carb.... Typically doesnt get out of the garage under 60 degrees

Yep