Box Stock vs. Restricted Box Stock in Iowa

I am been reading the rules/classes for English Creek Speedway in Knoxville Iowa. I see they have a Box Stock and Restricted Box Stock. However, when I read their rules, I don't see anything that tells me what the differences are between the two classes. I'm assuming the restricted is a lower class vs. the other?

QRC has a write-up on the general classes on their website, but they didn't talk about the restricted box stock, just box stock.

I'm looking for a class to start my 6 yo in. New to this, so any other advice would be greatly appreciated.

I'm trying to get to one of their races and talk to some people, but so far they have all been rained out. Hoping for good weather this Friday.

Thanks.
 
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