With the right tools it can be done fairly easily. Without those tools, he'll probably ruin ball joint boots, etc...
There are other methods but they are more time consuming.
First time I put 73 disc brakes under a 67 fish was 1981 or 2, somewhere along there. Wasn't an internet to ask back then. I figured it out.
When I took it for alignment the guy there says "You don't have any of this put together right". I said, "If you look at it long enough you'll find it wont go together any other way. Don't worry about the mule , just load the wagon".
I think he was quite surprised that the alignment did come in to specs but he had nothing more to say to me.