The right TLS front brake is found on YZ250H, YZ465, and YZ125L. They're expensive for a reason... although they come up at semi-sensible prices fairly regularly.
Ted does his bikes to a very high standard. If you're prepared to compromise on finish, then you can build a very good race bike for less.
The main things to do are:
get a good idea of what the bike needs;
set your goals, and;
do the maths
before starting.There are very, very few resto disaster stories that don't break at least one of those rules.
Regardless, it is VERY hard to make money by restoring bikes. Most times you can do that, is because you happened to have the parts in the shed and/or you got the base bike for a steal.
If you got the bike for a steal, then the easiest way to maximise your profit is to take it home, wash it and re-advertise it.
If making a profit is your motivation, forget messing around with old dirt bikes - you've gotta be in it for the love of it!