Currently got a set of greys to go in my build, people are saying 83's are better and flow more bhp?

What's the crack? Sorry if this is a repost, i did try searching... only mention i found was the spray pattern.

What will work better in my build?

Fully balanced bottom end Std crank and rods ARP'd
Wiseco 91.5 pistons
wrc HG
Turbosystems ported head
Turbosystems profile cams
AS Inlet
tubular manifold
CR T38
Twin air injectors
Wasted Spark