Read the stickies first, knock is what will destroy your motor, and it will get worse with a pulley drop so that's why you need other supporting mods first.

For a scanner either go straight for HP tuners (to tune) or get an Aeroforce gauge that will read many of the parameters of the car.

Something else, every car is different. Some people can run X setup for a 3.4 and others have to run Y setup for a 3.4, I might need rockers to run my 3.4 right now while other people don't need them at all. Don't read the ZZP guides for pulley drops, they're usually wrong.