My Street Demon install experience

watchdoc said

Initial, this is a mild 340 with J heads and small port Weiand 8007 Action Plus spreadbore. I haven't driven the car much in the last 10 years so I'm gonna run this gas out and do some tuning before I speculate too much. I will report back how it's running. I'd be surprised if it needed larger jets.

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I highly doubt it too. I would be willing to bet it actually needs 2-3 steps down. Carbs are always severely over jetted for liability concerns. You won’t know exactly where it is until you install air fuel gauge. I used to rely on reading plugs. But, Ive found the air : fuel ratio can be very rich even when the plugs don’t necessarily show that. I thought my car was running very good by upsizing the jets from where it was jetted when it was shipped. I found after a gauge it actually needed 3 steps down on jets. Makes a lot more power now.