The Trick Flow will NEVER make the power of a W-2. It's that simple. I know there were some versions of the W-2 with some cracking issues. I've never actually seen one though. I suspect some may be owner induced. I think it was Duntov (maybe Yunick) that said some guys can break a bowling ball in a sand box.
If you do find the Econ heads, contact Mike at B3 racing engines and have him help you set up your geometry. He is second to none and a damn nice guy and he will hook you up.
The only difference between the Econ and the race heads is the rocker stands. The econo head used saddles like a production head and the "race" head had the stands milled off and you need to use blocks with the shafts. Other than that, the heads are the same. Then in the 1990's you could buy W-2 heads with a closed chamber ( I hate the chamber as its like the W-5 head and it's a piss poor design) but you can fix it with some work. The open chamber is just as good. Either casting is the same port. Some of the newer castings had a bit more materiel in the ports and in other places in the casting.
I will say not to look at flow numbers alone. At 408 inches any production style head is a cork. 300 CFM out of a W-2 will make way more power than a production style head making the same, or even more CFM.
As for intakes...I still prefer the Strip Dominator. The edelbrock is as good and it's a toss up between the two. I just prefer the port shape of the Holley better.
