The carbs are identical. The 450 carb MAY however have a slightly larger venturi insert - I'm not certain.
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Only way to adjust timing for absolute max power is to set it while observing output on a dyno.
Otherwise set it per the owners manual or a degree or two advanced using a timing light.
But if a timing light shows the timing is "dancing" randomly more than a couple degrees at speed, find and correct the cause. Otherwise you're just chasing your tail trying to optimize spark timing! (Look for worn distributor shaft bushings, gears, centrifugal advance, etc.)
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