Executive summary:
1. The late camshaft is slightly advanced from the early. This means more
low end torque, less top end power. Nothing wrong in that if you are
running the car on the street.
2. There is nothing wrong with the late distributor either, it just isn't
designed with performance in mind. If converting carbs it can be hooked up
to the manifold and will operate just the way it was designed to do. As an
aside. We used late distributors for many years on race cars by removing
the vacuum advance, pining the plate and restricting total centrifugal
advance slightly, this allowed the use of Pertronix units long before they
adapted them to the 25D.
In answer to Marc's question. Dual SUs give much better initial grunt when
you hit the loud pedal than the DGV. This because the butterflies are much
closer to the bang bit. This adds up to a much better feel when the light
turns green, which is what it is all about.
The SUs are also much more forgiving to cam and mixture problems, so will
tend to be smoother and will mask minor tuning problems. They don't tend to
bog the engine the way an accelerator pump carb can when not set up
correctly.
hope this helps
Kelvin
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