I just finished the engine transfer on my 68 charger with a 727 automatic and when i went to go start it she would only start in neutral and when ever it went into park i would get nothing. So is this my neutral safety switch or should i be looking somewhere else? Also i needed a new alternator and the auto zone gave me a replace they said was the correct one for the 440 and it fit and everything but there was a sticker on the side of it that said a on board computer would control how much it charged the battery, but it fit right up and seems to work, am i using the wrong thing or is it fine?

Thanks for any input and sorry about the length