I've been reading about this puking problem for a while and have seen many theories of what the problem is. I never had the problem until I jetted my carb and bumped the float. When I found that problem I fixed it with float hieght found here in the tech article. I didn't like the results of the jetting so I went back to the stock main jet size for a 07 1700 which is a 182.5 I have a speedstar BAK and still got a carb cough just off idle no matter what I did. so I put a 45 pilot in it set @ 2-1/4 turns on the screw and it runs perfect plugs are all light tan. don't know the mileage yet. Point being I know I'm not running hot from a lean condition. So I took some temp reading from the cyl heads with a infared thermometer. Temps are intake side of eng 205F, exhaust side bottom of jug 215F-220F, carb area 165F. After I returned to current carb jetting and float level the puking went away.
If someone that has the puking problem and has rejetted could take some temp readings in the same area as I did, we could do some comparisons to see if it is heat that is doing it.