Quick story. A car I used to have ended up going 140 in the 1/4 at 3220 race weight. That’s making a little steam. W5 heads.
Those heads were on a bench that Best Machine used( high end excellent rep Mopar shop) they went 299 max. These are heads Ryan said went 330 ish.
Another set of W5 heads done by another well known Mopar head guy( even better known than Ryan) didn’t get over 300 on Vic Bloomers bench.
Moral of the story, flow numbers and benches vary, and aren’t much help in telling what a car will do at the track. Guys who do this stuff sometimes inflate numbers.
When I bought these Bloomer heads and Vic told me they were gonna work really good, I didn’t need to see any numbers, and still don’t.