A question or two about replacing hard drive on iMac

[Zmmin3]

I plan on swapping out 320Gb hard drive on my 24 iMac 8,1.
Can I simply take the new bootable clone hard drive that I made and simply drop that into the machine? Will the computer see the clone and automatically boot up into it?
Or do I have to make bootable clone then install a new blank drive into the machine and clone it back in?

Other question is...Would the Caviar Black be too hot? Or should I go with the Caviar Blue?

 

[simsaladimbamba]

Cloning before and swapping the HDD afterwards will work, no need for additional cloning.

How to format a new HDD to install Mac OS X onto (or make a bootable copy onto)​

 

[Zmmin3]

Thanks!
Now I just need to decide on a Cavair Black or Blue drive due to concern of any heat issues that might arise with the Black