I would use a Scat 4" crank, 360 mains if your sticking with the stock block.
Your not saving a ton with chevy rods and pins IMO.
What kind of cam (FT or roller or hyd roller)are you planning?
RPM?
Any rules?
I love building road race and circle track engines...they are a nice challenge and fun to watch go around the track.
Still waiting for my book Andy LOL!!