http://www.ebay.com/itm/4G63-Mitsubi...item58bc0966b4
That is what you want. They're good quality parts that multiple people are running at 800 or more horsepower. I as well as others have made threads asking about them and the response is always positive.
The only downside with bronze valve guides is you'll have to pay a bit to have them honed when they're installed. You won't be able to avoid this no matter the brand. Why not save money on the three and put what you save towards the machine work? My way to look at it.
If you're needing machine work or just want your block cleaned of flashing I'm your guy. I've got pictures somewhere of my buddies block I have a good 10 hours into just flashing and casting flaw removal. Just something to consider.