That is pretty good flow or a generous bench. MRL only got 280 out of mine.
To the OP, I have a spare set of gold colored rockers on shafts that you can buy for $50 shipped. 2 of the rockers look like they were run with the adjustments loose as it appears that the pushrods ate into the bottom of the rockers where the adjuster is. Shouldn't hurt anything. You will need to buy a hold down kit like the one Hughes sells.
Also, the best geometry article I have seen yet is:
http://www.hughesengines.com/Upload/productInstructions/LengthCheckerDec2012.pdf