You can buy a whole car with a documented service history and use that for donor parts and sell on what you dont use, this is the route i am taking and so far its cost me nothing!
That inludes the hire of the truck to pick it up and the conversion exhaust, it doesnt however include the carbs i want-still i am getting there!
The actual work involved is very straight forward in an injection car and having done this before, i can recommend it.
If you need any help with this or anymore questions, give me a shout.