Do 350's and 400's

Do they have the same size tail shaft?
If not what do I need to use the 400 I got. I need to pick up a driveshaft from the scrap yard and cut and weld. Just ondering if I will need a new yoke or can I take the one from a scrap yard with a 350?
Thanks for the help

well it is a 32 spline....guess I need to figure out what I need to order to get it all to hook up