Highest flowing sbm heads?

You haven't seen ANY?! Man. A W2 car on a stock stroke 340/360 exists. On the other hand I have seen several, over the years, 10.00 street cars with J heads lol.

No, I haven’t.
not bragging , but if anyone wants to take it that way, Oh well.
I had a 70 Duster street/ strip car. Full interior including back seat. Had two Kirkey seats, otherwise interior was bone stock.
Uncut, untubbed, not even mini tubbed, super stock springs, it was a true sleeper.
it ran 9’s with a 700 lift roller, 13 to 1 compression, at 3350 pounds with my 300+ in the seat. Very good W5 heads.
that car was honestly fairly legendary in these parts, running like it did.
so frankly, I find it very hard to believe when you throw around as supposed fact there are lots of NA W2 street cars running around.
it takes an honest 650 horse to get a heavier car( like I had) solidly in the 9’s.
650 horse W2 motors aren’t growing on trees that I am aware of. May be some, but they aren’t common or I would know of them