On a further note the "T" cable is incorrect the knob should look like the headlight knob with a white dot someone has substituted a throttle cable for it. Here are some pictures of exactly what you should have:
http://good-times.webshots.com/photo/2997794690102454676zVyDRw
First picture shows Ranco valve/heater w/correct knob
http://good-times.webshots.com/photo/2738738300102454676GDFfat
This shows how it looks under the dash (this is a 49) but shows the bracket/tube attachment (missing black knob).
Here is how the hoses look from the firewall side.
http://good-times.webshots.com/photo/2923223350102454676TQPsWQ
Hope that helps.