If you decide to change the headers too, you need to take into account that the bolts might break off, I had 8 out of the 12 snap and they don't come out no matter what you do. You have to drill them and it is a nightmare of a job.
http://986forum.com/forums/performance-technical-chat/70662-anyone-got-cam-locking-tools.html
Yours might just come straight out.