i have a stock 30 model A rear and torque tube. i want to put a 46 center section in it that i have. what has to be done to do this and keep the torque tube and the 30 axles.
To my knowledge - nothing - as it will NOT work. I believe all things model A are just thet - Model A, and all things post 1935 V8 are interchangeable. I presume you are after a taller ratio, so you will have to spring for a 3.54 ratio crown wheel and pinion from one of the dealers, like Synders or Brunton or whoever you favour.
The bolt patterns between banjo and torque tube are different style. Simpler to get a complete later banjo which already has juice brakes and shorten driveshaft and torque tube.