Respectfully request what to look for when shopping for a used carb

I am going to be assembling & breaking in some 360’s over the next year, sense I have some time to work my project cars & collection of parts.

I bought a running ( I watched on test stand $250) 1978? 360 engine to test my wiring, and carbs, etc. on for these roller project cars so I don’t test a prepped engine build with break-in with unreliable, parts-achieving that 20 minutes, variable > 2000RPM break in without interruption.

Which is how I would test the carb, but I don’t have any experience tuning. Will probably buy O2 sensors and anything else (how expensive is a wide band??? Sensor) needed against reasonable cost.

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What are your expectations for a used carburetor? To bolt on and go? How much are they asking?
$200, bolt on and adjust I guess, but without any adjusting experience. Thanks

Am looking at the Edelbrocks as a low maintenance, all around carb, living under the often suggested gossip: “Holley’s need more adjusting.”

If you don't have a fuel pressure regulator plan in installing one with the install.
-thanks I actually forgot about that.
Isn’t there 2 different ways to setup/buy the pressure regulators? With or without return line-the first being much more expensive?
6 psi correct?

Edelbrock carbs=garbage!!!..much better carbs out there to buy!!
I have followed your posts here along with others on FABO and assume you would recommend a 750 double pumper, either Holley, Quick Fuel, Holley-based Demon, or something along those lines.
A double pumper would go alright with the manual transmission cars I have, but I have no experience tuning, and only one car will be all out performance-the others will be freeway drivers, in hot traffic- stop and go 80, stop and go...
I did get a 3310 or is it 3311 and will try it out to, but want to try one of the new Edelbrocks.