The most you are going to be able to make on a stock 302 block is about 550 rwhp and have it last a little while... I have seen the stock blocks on a few cars in the 600 range, but they usualy dont last long... The Mexican blocks can take up to 650 rwhp, but if you go searching for a block or building one get a Dart or an R302 block or maybe an A4 block... It's not worth building a stock block...
I just rode woods, trail and stuff... No track... You can take 4 out the back, and you will loose a lot of low end in 1st and 2nd, but you will gain top end in high gears... It's not that bad really... She will get used to it quick...
http://photos-c.ak.facebook.com/photos-ak-snc1/v274/63/70/578954961/n578954961_643426_1698.jpg
The nurf bars are off of it now... This is an old pic... But i have skid plates on it now...
http://www.myaushorse.com/classified/images/Raptor%20660%20ph.1..jpg