amazing work, that 217 number is rear wheel? that great for a 6m. are you worried at all about the distance of the injectors from the combustion chamber? seems to me that could be part of the slow rev issue, by the time the fuel makes it in there it is most likely dripping down the walls of the runners and combustion chamber,
what if you welded on injector bungs in the tubes, just behind the butterfly on each one, just a thought... but seriously nice work.... it was worth every minute of your time!