You're gonna love that motor....that's almost dead-on my old 508 combo except I ran a very similar net spec (allowing 10 degrees for lash) 252/258 @.050 Hydraulic roller with dead similar lift and split. Same intake but you're probably packing a bit better head flow above .500 than my old stage V's.

Did Dwayne port the SD intake? There's some power upstairs there, I'm sure Dwayne knows all the tricks, they're about the easiest BB intake to open up and the long stroke likes the short runners and a big carb.