I know quite a few people have done D-series n/a builds with 13:1+ compression on pump gas. And that you can run 12:1 pretty safely with 93octane. But what about b-series engines, can you run 12-13:1+ compression on pump gas with those engines?

Why or why not?
I've also read that the small bore of the d's makes it so you can run more compression and stuff. Why?