73 dart swinger 6 to small block ????

:D:Dwell guys I was going to big block my 73 dart for my son but things have change and he no longer cares for the car..so my youngest son wants a box chevy ..lolololol yea right so I was thinking maybe he would like the dart if I can get him to work on it some..if not he will have to go to work and buy his own car..no work no car:D:D but anyway I was thinking maybe get a motor trans from a junkyard or somewhere that runs stick it in and go..but have a ????will a cheap header or even the manifold work with the power steering ?????I know with the big block you have to have the right manifold or headers not sure bout the small block with the power stuff...may just sell the car all together..