Is it possible the float levels wee set wrong during the carbs rebuild? Allowing to much gas into the cylyinders and loading the engine down at idle/start up. I suspect if this was the case you would see gas coming out of the carbs at low speed as well.
Kamikaze
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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