1983 Jaguar XJ6 Gas running out of exhaust manifold

I have a problem with gas running out of the exhaust manifold. I have checked the injectors and they all seem to be in order. I have also changed out the fuel pressure regulator valve. There doesn't seem to be a hose leak that I could find. The engine starts and runs smooth but gas runs right out the exhaust manifold where the exhaust connects. It has also run down into the tail pipe and you can imagine what kind of smoking it does. I know I could start a fire and need help bad. Thanks for letting me ask my question and would appreciate any help you can give.
Jerry