Not sure what the going price is, but of course a lot of them have been sent to the crusher. Getting harder to find, but because they have been used in the big motor homes for years, there is still a fair supply. You can find things like cast aluminum oil pans and such, but a cast pan is going to weigh as much or more than the stock steel pan does. Motor home supplier had some altered chain drive ratios but not something for performance.
What was your engine set up for your old Fiesta build?