Hi I live in Dallas Texas, I just bought 1975 CB550K and I'm having a really tough time getting her running. The gas tank and petcock were completely gunked up with crap, I shot carb cleaner down the carbs and took the bike out for a spin. I only made it about a mile then had to push it home, it ran pretty good then just lost power. I took the carbs apart and cleaned them when I was putting them back on a slow jet broke off in the carb body. I went out and bought a new set of used gunked up carbs for $140 and switched out the body. I threw the carbs on my bike and now when I try to start it up it barely fires up and when it does it back fires like crazy and sounds terrible. I have white smoke coming out of the exhaust and black smoke around one of the exhaust heads. I also have gas pouring out of #1 and #2 carbs.
I'm super frustrated and feel like throwing the bike away

I'd really appreciate if anyone in the Dallas area could give me a hand! I've tried to find some resources online on tuning my carbs, but the directions I have been able to udnerstand I have tried and the bike is still messing up!
RARGHRGRH!
(Thanks)