89 350 TPI Thanks

 

While the car is running take a can of carb/throttle body cleaner and spray along your vacuum lines if you hear the engine rev up you found a leak.

 

I prefer to use a plumbers torch ( the propane type ). Don't light it, just turn it on and point the tip around and when you hear the rpm's come up like hesaid you have found the leak. Carb cleaner is a slightly corrosive flamable liquid and I don't like having any liquids on my engines. The propane is a gas and dissapates quickly so a backfire in a carb car won't blow up in your face

 

Don't forget to spray around the throttle body gasket, runner gaskets, etc. in addition to the vacuum hoses.