We installed a temporary automotive carb to troubleshoot some other issues. The boat will not get on plane due to backfiring through the carb and low power at higher RPM. Under 2300 it runs great. Checked distributor, plugs; no obvious issues. I'm hearing it maybe due to the secondaries starving for fuel and we may need a carb that has sight glass to allow us to adjust the carb for bow-up to plane? Someone else mentioned a "wedge" plate.