It's going to be significantly over 100hp/L. With headers and tune it will be at 115hp/L. Just to put things into perspective the Mclaren F1 S70/2 produced 627hp from a 6.1 L block (102hp/L). Even at stock HP figures the S54 makes 107hp/L. I know its not a full blown super high compression monster but guys have built these things to well over 400whp NA so the potential is definitely there. Its closer to a race engine than anything else and has to be treated like on because of the tolerances.
The early engines were recalled due to out of spec rod bearings and rod bolts that stretch. I just picked everything up yesterday so I'll be installing the new bearings today.