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IMHO, needle selection is pretty important.
One of my customers has a '65 1800S with the original B18B, surprisingly low mileage and not a thing wrong with it. We changed from the original single-pipe exhaust manifold and stock exhaust to a dual-pipe manifold and Simons sport exhaust, and just that much made the original ZH needles unworkable. A set of KD fixed it right up.
For a while on one of my cars, I was running a stock B20E with HS6s on it, which had KDs in them. It was drivable that way, but DX needles were a definite improvement.
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