There are plenty of other opportunities for fumes to get into the car. When I got my 64, the steering column boot was completely shot, the seal for the accelerator linkage had fallen out and the seal for the brake linkage was missing.
Any one of those openings (especially the steering boot) are big enough to let in fume. I know--the car also came with a leaky master cylinder, which was dripping on the left exhaust manifold; I had smoke billowing into the car when I first got it running.
~Steve
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