Interchange? for 1957 3 speed>to full synchromesh?

[Dana Barlow]

Standard shift 3 speed with out first gear synchromesh*,can it be replaced EZ?
=with out needing= new drive shaft/bell housing/new rear cross member n mount?? With a full synch. 3 ??from? n #.
Or is it a big deal?no matter what?
Tran. in car is 27.5 in long to end of tailshaft,with Tran mount at 13in center from bell housing.
I don't want a 4speed,or auto.
Wondering if some did it? With out it being a PITA.