Paying $550 for an action isn't worth it to me. I don't think the barrel would sell very easily since most of us can't to the work ourselves. There is a clone Winchester 70 action out there for $350 which isn't too bad but RH only. It doesn't look too promising.
I know you can get about 100-50 dollars for the Barrel and trigger and maybe another 20-30 bucks for the stock and you have a blank stock. Other than that Leftys are hard to find being there is not much demand for them.