cummins conversion info needed

[bignbad]

I am thinking of a 6bt conversion I want to use my sm465 and my np205 and a gear venders od that I have. Does anyone know where I can get a adapter to mate the sm465 to the cummins? And can I use my current braking and power stearing ? I see a lot of guys going with the hydroboost set ups. And I want to add vintage air down the road. Do I still order a kit for 67-72 trucks knowin its gonna have a cummins in it. I know I got to box the whole frame for the cummins, atleat a 12in clutch. I really don't want to by a new trans n transfer case.