Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Most of our rigs have 'sliding goosenecks' that will allow you to position the boom most anywhere you want... as long as you get full hoist on the sail and tension on the leading edge of the sail.
You could run the boom a little high for more headroom... or lower for less heeling effort... take your pick.
You have the flexability to place it where ever you want. Most (I've seen) haul the head board to the top of the mast and enjoy the added boom height in the cockpit.
You could put it as much as 3' above the normal position for a tall rig... However, if you want it that high, you should check the clearance with the backstay, including with the boom tilted up perpendicular to the stay, as it could be in an unintentional jibe when it could hit the stay pretty hard. I suspect it shouldn't be that high--maybe a foot or a foot-and-a-half above the standard position, but not three (unless you want to shorten the boom). One foot higher is the same as a standard rig, and would leave your headboard about 2' from the masthead.
Another issue is the position of the mast gate (the opening for the bolt rope or slugs), which I don't know on the tall rig. Do you have slugs or a bolt rope? If the rope, you need to have the boom below the gate. If the boom is above it, take some precaution to prevent it from sliding down to the gate when you drop the sail, since a free-flying boom could be a bit of a hazard (to you and to the sail) when you're trying to flake and tie the main.
So, I guess I have no answers--only questions. (That's a "consultant" for ya.)
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.