Also just found this
Edelbrock does not manufacture a Thermo-Quad carburetor.
Instead, Edelbrock's 4-barrel carburetor line is based on the Carter AFB (Aluminum Four Barrel) and AVS (Air Valve Secondary) designs, which Edelbrock acquired and continued producing
Key Details
• Original Manufacturer: The Thermo-Quad was originally designed and built by Carter (and widely used on Chrysler/Mopar vehicles from 1971 through the mid-1980s), featuring a famous phenolic plastic main body designed to insulate fuel from engine heat.
• Edelbrock Alternative: If you want to replace a Thermo-Quad with an Edelbrock carburetor, Edelbrock doesn't make a direct Thermo-Quad clone. Instead, they offer square-bore or compatible Performer and AVS2 series carburetors.
• Intake Adapters: Because a Thermo-Quad is a spread-bore carburetor (larger secondary bores than primary bores) and Edelbrock carbs are typically square-bore, Edelbrock sells transition adapters like the Edelbrock 2696 or Edelbrock 2697 adapter kits to mount an Edelbrock carb onto an OEM spread-bore or Thermo-Quad style intake manifold
Tony
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