5.3L LS motor swap help
 

After reading an article in Hot rod magazine where a guy put a 5.3L Silverado motor in his third gen, I thought to myself I have that exact same motor sitting on a stand in my shop. I am wanting to put that motor in my 91' RS with a Tremec T56 6speed, I have a few questions about this swap. How much modifications am I going to have to do to my engine bay? and with this new gearing should I use for all of this? Keep in mind, I have a 1984 Mustang SVO that I have to out run, so I need the best gearing for a 1/2mile drag race