What Carburetor Fits This Manifold?

FWIW: Some International truck engines used the TQ as an OEM part.

The biggest problem I've seen with used TQs has been caused by someone getting ham-handed inside the carb and stripping out stuff which renders the main body unusable. Next in line is getting one adjusted so the secondaries don't open too soon or too fast (how it got the sobriquet, "ThermoBog").

TQ rebuild kit source, https://www.carburetor-parts.com/Carter-Thermoquad-Carburetor-Rebuild-Kit_p_735.html