Crash- Header tank question

[beeman]

I'm ready to order your header tank, plan is to ditch the front C5 surge tank and install bleed points the radiators. I've been through a lot of old threads and appreciate the effort you put into making our engines survive!
I do have a question about something you talked about back in 2010... I believe you said you had to add a 2nd steam vent line because your engine is not level? Can you expand on that? Is that a typical issue (Porsche tranny)? Is there an existing port or would I need to drill and tap?
Does your tank have all the fittings needed or will I potentially need to add any? C5 hose sizes, right?
You talk about continuous flow through the tank, does that occur as configured? I'll be running a constantly flowing heater core (Honda unit) but I also may order your Heater Bypass Valve if that would divert warmth from the cockpit in the summer - it would, right?
Thanks!
Dave

One more question- does your Heater Bypass Valve draw continuous current in the open or closed position? Also, does it use engine vacuum or create its own vacuum?