My last z was a back half car,unless you are going to do some serious racing,you will be amazed at how much power the stock front of a Z can take with some bars from the roll cage to the strut towers. With a small block 434 chevy my 280 went 8.98 in the quarter at 152mph. It was on the ragged edge of being safe, so this is why I am building my current full tube chassis 240 Z. This car will have a blown 496. I would not recommend a kit form set up,have the chassis custom built and your leg room will be much better.