Other sites report that ALL the heavy hitters:
Rock & ACK attack, Al Lamb on 1000cc turbo Honda
and Ralph Hudson 1000cc turbo are on the salt and
prepared to run - and may have already done so.
Two (2) "local" guys have run, but under 200 mph.
The "thin" air should help reduce air resistance,
but will hurt normally aspired engines. The turbo
guys should be able to make more boost, but
turbo sizing gets complicated, and does intercooling.
Just the reduction of air resistance should allow
the ACK ATTACK to go 420mph, and the move to use
6 speeds in the transmission; instead of three (3) from
10 years ago, might push the bike to 435 mph.
Should have some interesting results within 24 hours.