Some basic questions
How long to install.. About 6 to 10 hours, depending on your skill level and application.
How much horsepower.. Jackson racing claims about 40 percent over stock
What mods are needed.. None, you can use this kit on stock components. Although I would personally upgrade my fuel pump.
Instruction..
www.jacksonracing.com has step by step instructions. Follow them to the t, if you don't it will cost you alot of time in the long run. They have done an excellent job with their instructions.
Other things.. Jackson racings has the best tech support I have ever talked to. I have had to call them on a few things. they are right on top of there product. Don't be afraid to call them
My personal prefferences.. Always carry spare belts and tensioners. All jackson racings size belts can be bought at any parts store. You just have to cross refferance the numbers. I personally just carry extras. I hate to be stranded.