Fuel PSI

64 225/6 Putting a fuel psi regulator in-line. What is the best psi??? I am still,after 2 months, having carb issues. Flooding out carb after putting load on engine.I put a new fuel pump on,maybe putting out too much psi. If this don't work,gonna trash this carb and buy a new one,sick of messin with this damn thing. I can run engine forever at idle in my garage,as soon as I get it on the road, it floods out. Needle and seat hold and no leaks in floats,Carter 1 barrel Thanks again and need some help before I throw this carb in the river