The short z28 arms will yield you some, but probably not enough. The max backspacing is usually 4.5" with 17's and short z28 arms using the ridetech spindle. The bumpsteer kit will be tough to get on since the bolt hangs down further than a stock tie rod. I would seriously look at the Tru turn as that will solve your issues. You may come close on the headers as it seems most of the fitmet was done with LS motors. Another option is to use a stock spindle and do the Guldstrand mod. Below is a pic with ridetech spindles a 17x8 with z28 arms and 4.5" backspacing and the baer tracker kit.
