The roadsters were geared for the Bonneville salt flats! Original rear gears were 3.70:1. With these gears, the car would break the legal speed limit in LOW gear.
Finally changed out the 3.70 to a 5.13 so I could use most of the gears. In 5th, the engine was still way below the power curve. But the 5.13 introduced another issue...........traction. Datsun/Nissan didn't offer a limited slip, and the locker on the street was no fun!
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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