I don't wanna burst your bubble... but it won't lower it a full inch, in fact me putting the R/T coils on my 4.7L didn't even lower it a full inch in the front. The reason behind it is... and I'm sure you can figure this out, but the weight of our engines are simply not heavy enough to get that full one inch of drop that you may be looking for.
Don't get me wrong, it will probably lower it a tad, and it will increase your stability, and lean, but it won't lower it a full inch. I'd say buy them... cut off a half inch, and THEN stick them in there... that'll give you that true one inch drop, and will give you that stability, and lean help that you are probably looking for.
Paul