TPS voltages may be close out of the box, but you really need to check them. If your TPS is off by even a few hundredths of a volt, your ECM power enrichment (happens around 86% throttle where it disregards the O2 sensor above that) won't come in at the right time, also you can have TCC lockup/kick out happen at weird times, or not at all. And you can't afford a 307 to lose ANY power. A 5V (roughly- this is the part that can vary between cars) reference signal is sent to the TPS, and the TPS resistor is changed by the throttle position.
But the TPS case has to be placed in the correct spot. On the high step of the fast idle cam you have to adjust it to 0.52 Volts output going back to the ECM. Of course, you have to get the fast idle set right for it to be correct....you can see real quick on why everything has to work together in the CCC system. Unless you do a check, you'll never know where you're actually at with the carb settings. I don't care WHO rebuilds it. Yeah, they can get it close, but you always need to do a final dial-in check on your particular application. The CCC carbs are very touchy and need to be set EXACTLY as GM procedures dictate to maximize the driveability and efficiency of the carb.