Carburetor spitting gas - have already replaced Carb!

Hello all...

Well, after weeks of trying different things, I finally coughed up the cash to get a replacement carb and I have the same issue after I cleaned it. Here's the background:

- This is an 18 y/o Craftsmand 19.5 riding mower

- Problem started with coughing carb, no power

- Replaced air and fuel filters and plugs (while I was out, changed Oil as well)

- Same issue; low power, coughing

- Took carb off and cleaned thoroughly; all jets clear, gaskets were old (never replaced)

- Started well, but gas vapor through top of carb. Engine would choke and die when i put Air filter and associated housing on

- Took back apart and tried again. When Mower was driven under load, engine would sputter and die after a few minutes

- Bought the appropriate repair kit. Replaced all gaskets, needle, valve, etc. Same exact issue with no improvement

- I finally bought the entire carb and put it on today. Same exact problem.

Seems like there is too much air and its spraying the gas out the top? I really don't know what to look at this point. There aren't alot of options to adjust air/fuel on this. Any ideas would be helpful.

Thanks