Demon carb troubles
 

I have a 750cfm speed demon on my camaro. I got it second hand and it ran great then developed a vacuum leak between the main body and base plate. I put a new gasket on and it ran fine for a little while and started the same problem. When i went to take the 6 screws out of the base plate out 2 of the pulled out the threads from the main body. Any suggestions on what I can do?