You already have the heads. I wouldn’t waste money on different ones. My vote is to try the heads, and have your current cam reground with another 15 degrees and more lift. A cam regrind is only 150 bucks.
The w2 is gonna work better than any aluminum head that doesn’t have a offset rocker. Even if the advertised flow is the same as the w2 the w2 will make more with the extra cross section.