Kris,
Here's the original thread - it has a bit more info than the dyno one, and confirms the street orientation:
http://www.460ford.com/viewtopic.php?t=20258&highlight=
If I read correctly, he will produce rockers that are a bit improved from the originals - and much more affordable, although affordable's a relative term
The original valve covers are supposed to fit fine.
Jon mentions using a hydraulic roller cam too.
Tom