I just bought a great 1965 Plymouth Belvedere. The car ran great coming home on the highway. Then I needed to hit the brakes hard for a yellow light. After getting off the highway The car stops so-so, could be better. The problem is the engine starts smoking at the red light. Was like being on a cloud all this white smoke comes billowing out. However, while idling, the smoke stopped, and there was no smoke while taking off. Come to another light have to hit the brakes harder then normal. Cars smoking again at the red light. Pull away the white heavy smoke is gone. Get home revving the engine up no problem a little smoke on deceleration but nothing major. Car has power brakes. Could the power booster be leaking brake fluid into the intake manifold? Brake fluid in master cylinder seems full to the brim. Any ideas please someone.