Don't just assume she needs longer pushrods. I'd suggest checking for optimal rocker arm-to-valve stem tip geometry. For info, google "Comp Cams valvetrain geometry."
It's kinda hard to check geometry with hydraulic lifters, but you can use a lightweight test spring to make a very light "witness" mark w/o compressing the lifter. Geometry is less critical with stamped rockers that slide across the valve stem tip than with roller tipped rockers, but still, you don't want to chance wearing down the side of a valve stem tip.
As I recall you have stamped rockers. If that's the case be sure the rocker arms are not hitting the retainers, and that you are not using guide plates with self-aligning rockers.
Also, here are some race engine builder comments on what Edelbrock says about the E-Street heads not being suitable for roller cams:
https://speedtalk.com/forum/viewtopic.php?f=1&t=53337
Many of the guys at SpeedTalk.com are engine builders, head porters, and cam grinders. They are WAY over my head most of the time.