Stock sb rocker arm ratio ?

JMO, but if you don't want to spring for the price of roller rockers, why are you worrying about what the stock ones are? Your stuck with what you've got unless you buy a set of rollers. If it's a budget build, & there's nothing wrong with that at all, you cant look to chase every bit of hp out of it. Just run the stock ones & then if budget permits later add the rollers. Easy enough to upgrade. We have all been there during a build on a tight budget where you gotta decide what to spend where. Not trying to be a jerk here, just offering another way to think about it.

If you want to make an omelet, you gotta break the eggs!..