Switching to Eddy heads on a 360

I bought a set of Eddy heads this winter for my 360 and was wondering there are any serious "do's" or "don't's" when it comes using them?

I know that they require different head bolts and already have them. I've heard that certain headers don't fit them (Spitfires), but are there any other hidden issues?

THANKS IN ADVANCE FOR YOUR HELP.