TQ novice needs more advice

Thanks for the reply, rumblefish360. Let's see if I can ask my question more precisely.

From the Tomco website it appears that there are two different kinds of TQ phenolic fuel bowls: open trough and closed trough. The website has a drawing showing the difference (so at least I know that I'm looking at the right area of the fuel bowl!), but their drawing is really hard to read so you can't tell what the exact difference between the two types really is. Also, I believe the two different kinds of fuel bowls take different rebuild kits, so you need to know what kind of fuel bowl you've got in order to buy the correct rebuild kit. Am I right about that?

Now I'm not sure about this, but it also appears from the Tomco site that some TQ throttle plates take a closed trough fuel bowl and some take an open trough one. I am just trying to make sure that I am matching the correct type of fuel bowl with the throttle plate that I want to use.

Or am I making this too complicated? Can you use either type of fuel bowl with any type of throttle plate?

Thanks again for your help!