OOTB Stealth vs Prepped Stealth?

Fedex dropped off a set today. I read an old hotrod forum thread from heyoldman in 09 on the stealth head.
I was wondering if flow #'s would be close if I did the cleanup you recommended in that thread.
It seams like a basic procedure I am capable of doing. or is Cody doing a tad more grinding and I should send them your way.

ps, 440 must have seen the state sent , and thought of you. quality looks pretty good. lol