Gene,
When they milled off your choke horn do they have to do anything else to your carb to recalibrate it or just mill it and ship it back to you?
When I pull the airfilter on mine, even thought the carb is sealed to the scoop I run an aircleaner baseplate and a K&N snubstack on mine.
I'd pull your seats out.
I lost almost 85 lbs by removing my back seat and passenger seat. If your going all out ,take a 1/2 hour and gut the interior. I have and done it more than once on mine. And its currently gutted down to the steel!
I run a Mr Gasket cool can on mine. IMO its important since the carb hangs out over the header/exhaust manifold.
On mine open headers usually slows it down 2 or 3 tenths so I wouldnt try that if I was you.
Later,
Doug