It depends on flows, but if they're med-high, I wouldn't suggest it unless you're solid in the IV range. The East doesn't allow for much of a breather in between rapids, eddys are small, and everything moves in a hurry. We had a group of 3 IV-V boaters on it last weekend and were able to read-and-run the whole thing in 15 minutes or so, maybe a little less. There be big holes.
If you're looking to step up into IVs, I'd suggest something that has IVs with some recovery room below in order to pick up the pieces, if need-be. On the East, you probably won't recover a boat until after Stupid. It's also not terribly easy to scout any of it. That, combined with the fact that the CB area doesn't hold much else of interest to you, and I'd suggest trying something else.