It's not being hurt by the 750 if it's working correctly. You can try a different intake and smaller cam. Or, more converter and gears. Either way. I think 14.4 is a great baseline with a lot of opportunity.
It’s getting way to much fuel in it. Put the accelerator pump on lowest point and helped it out but not a whole lot. Going to pull the jets and see what they are and go smaller if needed to see if that helps.