Well, I'm not totally convinced that my local machine shop knows what they are doing, but they insisted that I mill the pedestals in order to use guide plates. My problem is that they took off so much material, that one of my studs stripped the threads in the head. I had to heli-coil it to avoid a costly repair. Otherwise they're fine. I have '69 351W heads so I had hardened seats installed. I'm using the stock '69 351W rockers with stock 5.0 pushrods and it all works fine. I still don't have the money to actually buy the guideplates and the roller rockers. I'm also debating whether I should trash these heads and rebuild another set. If you want more info on this setup, see my web page: http://www.totalaccess.net/~jknapeks/jon.htm
Hope this helps,
Jon
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