Yeah....thats the best way to do it. Lay the headers in the engine bay and if possible get a friend to help you out. Lower the engine in and connect the headers as you lower it down. The steering linkage SHOULD fit afterwards, if it doesn't you'lll either need to "massage" the primary tube that it runs in to, modify your steering shaft or buy a better solid steering shaft.
That's the method I used to install my MAC 1 3/4 long tubes on my 351 stroker, and it worked alright. Still got a few scratches on the ceramic coating, but I guess I just gotta live with it.