engine swap mounts ????? 6 to b

73 dart was a 6 and now going big block 400 what are the mods that have to do to the kframe to use the mounts??????I have the spool mounts and the 400/727 to go in ..I know I have to use a (or) need to use a manual steering box , and the right headers or manifolds but right now I would like to get it in this weekend if I can when I get home.... also if you have any pics that would be great...plan to install the motor/trans all together I hope