In the interest of clarity, remember that's the name of the carb, not the manny. If the carb is off, one big visual clue would be to see if the bore is 4 holes of 2 different sizes. Smaller 2 holes up front for the primaries, and, you guessed it, the larger 2 in back are for the secondaries. If they are 4 of the same size, then it's not for a Thermoquad, or any other spreadbore carb.
Give more info if this doesn't answer the question. Do you think you know what carb's on it if installed, if you don't, then pull the air cleaner and describe to us. Do you have a Chilton's/Haynes manual?