massive reconfiguration time again.

I’m guessing the 596’s in question are nowhere near 270cfm.

And I wouldn’t recommend spending any money on them to try and get them close.

Most of the “home ported” variety of stock SB heads I’ve tested are usually in the 230 range.

A proper valve job and bowl blend on the SM heads would put them in the 260 range.

For a street/strip car with an 833, I’d expect to need more like 115+mph speed to be able to somewhat reliably get into the 11’s.
Unless you’re able to whittle the 60’ times down beyond what is typical for that type of combo.