Headers for my 71 Demon 340.

Mopar guru of mine here in Aus says the only way to fit Dougs long tube headers is to remove the k frame then lower the engine with trans connected then fit the headers & refit. Also need mini starter which I've got already.
Quickest & least frustrating way of doing it.
Ordering some Doug's long tube ceramic headers D453's tomorrow from the states. Unless anyone can talk me out of it.