which healer should do what?

[uktank]

Hi guys me and friend have made a new guild were 6/7 in firelands after a couple of raids but ive ended kicking our drood healer.
Now im left with Pally-Priest-Shammy

Im thinknig pally priest on the tanks and the shammy raid healing is this the best setup i can get ?

[Bulldaddyg]

In our guild my Shammy is the healer in our Pally/Priest/Shammy setup and we do much better with me on the raid. I throw some heals on the tanks when needed and use my earthshield/riptide on them, but from a healing & mana stand point I would go with what you have.