1968 GTS 340 with Carter AVS 4966S

Thanks for all your replies and your great help, got it runnin after some adjustments :lol:
Took about 10 Minutes and it fired up. As suggested by Bewy i only used the thin gasket. After it heated up i adjusted idle speed. Runs good on all 8 cylinders, throttle response is really good but the idling is a bit rough and at higher rpm there was some backfire. For the first start I am really happy with the outcome, next weekend I will do some detailed adjustment.
Oh and choke is still not working properly now I am thinking about an electric conversion kit, let me know your thoughts on that.
Thx!
Chris