Driveshaft and crossmember shopping info?

[shadango]

Hey folks....just started looking for a a driveshaft and tranny crossmember for 72 Barracuda that is running an 8 3/4 rear end (2.76 gears, small yoke I think?) and a 1976 318 engine.....planning on 727 tranny.

Can anyone give me an idea of what I should expect to pay, used, for these and what length etc I might be looking for as far as the driveshaft and any other info that I might need in my search?

Thanks!