Thanks Eric, that's great info.
I've got a pretty hot little 360ci SBC in it now. It's probably a solid 400 HP motor, so I want to do something that's going to be a significant upgrade. Current motor is fairly high compression (11:1) and the block has a repaired starter mount that may not last so it's probably not a good candidate for power adders or other upgrades. Putting together a 355 for a blower may be the way to go.
What kind of power numbers do you think you're getting with your 377 motor?