From my reading the carbys are the same but use there are different jets for 125 and 160. Sounds like you need to get a part time job after school mate. You've certainly done well to save your money for a year.
Now I giggle with visions of lawn mowers tied to the roof rack going down the highway for 2 hours!
As for mowers that are beyond it, try squirrel away what you can. I wish I had the room I have now when I was a pup with al the treasure I sold or scrapped.
I have a manual printed by Gregorys on the Victas from 1955-1981. It's by no means exhaustive but does cover most things. If your interested in particular bits I can post them somewhere or text them to you if it helps with carbys etc.
