Trouble with a new Thermoquad Installation

I ran a thermoquad for years first on my 273, and then on my 340, and it was a bugger to start for a long time. We tuned and tuned and played around with it for a long time, and nothing seemed to work. What we finally discovered was that the resin center piece had warped just enough that gas was leaking back into the engine when the car was parked causing the car to flood. Took off the TQ and went with a Carter 625 and have never had an issue with start up since. Those resin centers are known for warping so just make sure it is in good shape.