No, a larger jet will only make more power if the engine is lean to begin with. If it's about right, you'll just use more gas. If it already has a 62 in there, you can probably leave it. If it is smaller than a 62, you may want to consider putting a 62 or a 63 in there, but that's just my experience. What is in there now?
I know nothing about these carbs, but from I could tell it's a 1945. Maybe enlighten me some?
It's also ironic that you talked about the D-shaped throat, because I had looked it over and saw nothing really in there that would cause for it to be designed like that. I had seriously contemplated rounding the edge over for easier flowing air, but didn't know what was going on under there.
Please forgive any of my ignorance, I'm a throttle body guy
