Welcome to the machine!
Can maybe try gravity bleeding overnight for the brakes.
White smoke might be gas vapor, like maybe a stuck carb float.
Yea I’ve tried to do gravity feed by keeping the brake lever pressed down to throttle for 2 nights and didn’t work. I tried to reverse feed the oil didn’t work out the best so I ended up doing the basic press brake and open bleeder valve. Started to feel something but didn’t get to finish till I got full pressure
When I rebuilt the carb the only thing I didn’t replace is the diaphragm. Not sure why it would be sticking unless it’s a problem with the old diaphragms. Or could it be the throttle slide?