Re: 351 Questions
Hi Jake, Welcome to the club. I've seen some of your videos and you really do good work!
As to your question about jet numbering, all I know is that the sizes increase with the numbers, and some people have gone to larger jets with some success. Also, I have a Bendix/Stromberg catalog that shows your carb number 23-120 is correct for your 5000 series with the 351.
Concerning the loss of power, since you say the carb has been rebuilt before, I would look there first.
The power system, which includes the vacuum power piston, may not be working properly. Make sure the gaskets above and below the throttle body aren't blocking the small opening (vacuum channel) leading to the intake manifold.
Not trying to underestimate your ability, just some things I would check if it were me.
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