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You don't say what ignition system you have. A 67 Normal engine (there is no T until 1968) would have had kettering-ignition, that is, points, condenser, coil, ballast resistor.

In this case upgrading the ignition would make a lot of sense. For technical reasons which can be found elsewhere on this web site, the Bosch coil has a hard time charging sufficiently for high-rpm operation.

I am no particular fan of CDI ignition, even though I have MSD on both cars at the moment. If I were you, I would try a "hot-spark" which is sort of an advanced version of a Pertronix Igniter-- it's a hall-effect trigger with current limiting. You run this in connection with a coil that has lower primary resistance than the original Bosch-- the higher amperage allowed by the modern electronics will charge the coil faster, and helps with the high-RPM operation, at the same time maintaining the long spark duration of an inductive (not CDI) setup. CDI has very short spark duration and the multiple spark thing, well that's just snake oil. Once the flame front is burning, another spark doesn't help.