Carter seemed to "waffle" on the type of accelerator pump discharge valve to be used.
The early carburetors, mostly, started with a small ball with a small square weight on top of the ball.
A few of the early carburetors and all after maybe 1958 came with a square pointed needle that was the same mass as the combined mass of the ball and square weight.
A few of the carbs that started with the square needle were switched to the ball and weight, and then eventually switched back to the square needle.
I would use the square needle. This is what comes in most kits.
Jon
