How much for 71 Thermoquad?

Try reading your own literature. The 1930 patent carb that YOU introduced into this thread is substantially different to the 72 TQ:
- it has no air bleeds. The TQ has three.
- the nozzle at the exit end has one hole in it. The TQ has two.
Any fool could see this is going to have an impact on metering characteristics.

In post #42 you claimed that the 72 design is 'far superior' & that the air bled design is a compromise.
[1] Far superior in what way? If it is in power & throttle response, where is the EVIDENCE. Still waiting after 150 posts....
[2] There are 0000s of compromised carbs out there working very well because they use the air bled system.