Both are excellent (427 & 289 ). If you are doing mostly street driving and assuming you will be driving within the legal limits either car will suit your needs.
The 289 has more historical race history behind it while the 427 has more street presence and charisma (mojo, if you will).
The debate on which is "better" will go on forever (those SB guys just don't get it
) ).
Don't worry about a 427 handling the curves on your local roads. Read the recent Motor Trend article on the Shelby 427 and 289. Through the slalom course the 427 posted a quicker time than the 302 equipped 289 car. Motor Trend described the 427 as a big puttycat.
As to Kirkham or Shelby. You won't go wrong with either.