But I believe some of my cams were out be 3 degrees. Since your're going that deep into it...I would do 500+ cams and BDE gears (assuming you want to keep your car). The other people I talked to regarding the timing said it really helped idle. My motor is done but I haven't installed since I'm in Afghanistan.
If you do cams/gears...you have to do the later year(s). Contact Brett Dempsey at brett@bde-performance.com