The rabbit hole is very hard to resist sometime. Many of us have been there. In order to not waste time or money and save frustration ask yourself what your want this car to do. Do you want a 13 second car? Do you want to run autocross? Once you know what you need out of this vehicle its easier to get there. The factory hardware is very capable, understanding how parts and systems work together is key in the tuning process. Your current 340/727/8 3/4 is easily capable of being quick enough to scare the average person. You may be surprised what a good tune and a set of drag radials will do with you current setup.