Not to be brutal, but Ford Tech's don't know their head from their ***, and usually when I see people say they talked to a Ford tech they have all the wrong answers. A guy who has a basic understanding of how engines work, and then applies all his theory's to products with no knowledge. They dianosed my friend's backfire as a "loud miss" not a backfire, and it was caused by his spark plug wires, not his fuel injectors. RIIIGGGHHTT.
If you have the TFS intake, the TFS TW heads are better. They won't kill your low end because they don't have primaries that are oversized, and they have excellent flow all around. Port velocity isn't bad with them at all. Ask a lot of people making max power at around 5200-5400rpm. As far as the cam, TFS #1 is better than the E303 in my opinion. With all the problems people have regarding idle surge, and the seemingly great performance of the #1, and cheaper price, I'd probably go with it.
You can go with Edelbrock if you want to. They're good heads, and built with quality. They're no match for the TFS TW heads out of the box for power production or flow, though. They're also more expensive than the TFS heads. It's not hard to find TFS TW heads under $1000. The difference in price between the TFS heads and the Edelbrock will cover rockers. Not to mention you can still sell your old rockers. You'll also need to change pushrods with the TFS TW's.
It's up to you, obviously, but I know I wouldn't choose the Edelbrock over the TFS, and I wouldn't get a set of GT-40x period.
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