How far off do I have to be to fail? How far off is the best you've done on a typewriter? Are we talking about a millimeter, or a tenth of a millimeter, or a hundreth of a millimeter?
What is the standard?
1/4 the thickness of the width of the letter: match the half-width vertical strip of the number "1".
That's the resolution I can identify when the "old" document is superimposed on a modern word-processed document using the yet-to-be-invented-font that was suppsoed typed in the 1970-'s.
And, by the way, type me up a "'" too while you're at it.
Try it out and we'll see. Right now I'm betting that you can't match the overlap found on that image. I doubt that all but the most skilled typist using precise rulers and the sort could come closer than about 2 millimeters or maybe just under, and even then the alignment and spacing would still be off producing no match.
Put another way, I'd expect you to produce something that, if you set it directly on top of either the MS word version or the forgery, you could still easily make out what the address was.