kombi valve guides - what\'s the good word?

Hey all,
I'm doing a complete top end rebuild / head service on the 1800 type 4 motor. Exhaust guides are shagged. I got new ones and after knocking out the old ones I find that mine are on the 2nd oversize (13.21mm OD). Obviously I need to replace with oversize ones.
I've had advice that this might cause problems later with the head material being too soft etc. Any thoughts on this?

Also, I'd like to share pics of the rebuild for those who might be interested. What's the best place to post? Here in tech talk?

Cheers, Toby :thumb