The short answer is yes, as the x-over has the 'grown-up' back end!!
As long as you have all the tinware etc, there will be no [big] problems. I'm preparing to fit a 2.0 CU from a T25, so have had to spend a long while sourcing all the tinware, mountings and so forth.
Depending upon the gearbox you fit, there may be a bit of fettling required with the gear linkage, though I think the 1700 came with a 3-rib 'box, same or similar to the 1600 type 1.
You'll need to do some wiring for the alternator and regulator and possibly need to shorten/extend wiring to coil and oil pressure sender. Depending on carbs etc. you may need a longer throttle cable too.
I'm sure there's more, but it WILL fit.
Cheers,
David