Can someone set me straight 305 to 350

[ozkiwi]

I am going to buy a basic 350 crate maybe a 260hp to replace the original 305 in my 86 silverado shortbox.
I don't ever plan to add any performance mods to the motor I just want a reliable motor for my everyday driver with low end torque and similar economy to the 305.
What I need to know is will the exhaust manifolds,ignition,quadrajet and inlet manifold.water pump ,fuel pump all swap over ?
I am getting a shop to do the change over here in Australia and when getting quotes they all say different things concerning the the above.
Way too lazy to do the change over myself.