I had a similar starting problem with my MK3 Supra I searched and for MK3's atleast this is a common problem. Basically the stock wiring eventually will not send enough voltage to the starter to get it to spin. So you run a 30amp relay to it and Wha-Lah! My SUpra started!
Here's a link to the thread
http://www.supramania.com/foru...76403The original diagram in the first post kinda sucks in the middle of page 3 is where you'll find the pic I posted up for you. I know the harness is different but the theory is the same.
Dam nice build keep it up!
Oh about the 56K thing as "Ghast" said "56k is the old school Dial up connection through the phone line." People say this because it is a very slow internet connection and in posts with many pictures it will take a 56K user forever! To load up the page (I'm not sure but that may cause issues with others trying to view the thread)
Peace!!!