As far as 5.3...the rules read 2 barrel carb...(auto correct, sorry).
I'm guessing 4 barrel intake w/adapter.
The fuel injection would be interesting.
The crate motor rule also applies to the street stock class...
According to Royal, they're trying to keep motor costs from escalating in both classes.
There are some really stout (ie.pricey bullets) down south in both street stock/X mod.
We'll see if anyone actually goes the crate route.
Also...
I forgot to mention the carb rule clarification.
Anyone running a Holley 4412...the metering block MUST have a Holley part number.
No aftermarket metering blocks will be allowed.