With the 235 passenger car engine a Rochester BC carburator is stock.And i want to use it because its a new one. I started the engine for the first time after the remanufacturing and it runs pretty good, but the carburator is not acting as it should do really? My question is how to install the short straight tube that goes from the carb side towards the exhaust outlet and should catches the heating that effects the carb autmatic choke? Pictures are very welcome. Thanks Martinius.