Bbody 4 speed

So I have a 68 B body 4 speed. To install it correctly in a A body. I just need the proper tail shaft and main shaft for a Abody 4 speed? I know those are expensive to get. I'm fine with that, if it means it will get done right. I understand there are other ways the B/E body Trans can go in without those pieces but I like to do things right if.i can.