W2 head porting observations help needed!

pittsburghracer said
My old 3/8 stem 2.02 valve W2 heads hit [email protected] and fell on their face. A standard 60-45-30 valve job and a what I would call quick porting work they were up over 300cfm. Like I’ve said on W2 post before my econo heads were the number that were prone to cracking, which they did two years later, so I didn’t spend a lot of time on them. I easily ran 9.80’s at 2800 pounds on pump gas (Bp93) on my 408 with a Racer Brown .520 lift solid lifter cam.

I read your posting about those, like I said my overall flow numbers seem really low, which is probably my air source, so I'm just looking at the increase percentage wise, and wondering where to bring to gain a little more. All you guys are way smarter and have way more experience than I do! I'm grateful for the feedback