Highly informative.
I meant to say that you should pick up the correct hops and that the two you suggested would make a completely different beer.
If you want a break down of the varieties you have, I suggest using google or the search bar at the top left of your page.
Chinook and Williamette will make beer, but completely different from this beer. Personally I leave Chinook for pales and ipa's (dank grapefruit, very bitter). Williamette to me is spicy, fruity and a little woody. Cascade is fruity (light grapefruit) and floral, and Centennial is a stronger, more powerful version of Cascade.
Since this is a blonde ale, I would leave out the Chinook for sure. And if that's all you have I suggest ordering two 4 oz packages of Cascade and Centennial from Farmhouse supply. Good product at a good price and with fast shipping.
http://www.farmhousebrewingsupply.com/scripts/default.asp
Hope this helps!
Maybe he meant to say that using those hops instd of centennial cascade will result in a completely differ end product. In biermunchers first post he says the secret is I the name and describes how he worked through the various hop profiles. I would suggest make the recipes as stated the first time and then toy with differ ingredients.
+1