Just imagine how disappointed the OP will be after spending $XXX dollars on "upgrades" only to find out he doesn't get noticeably faster. Removing four pounds of bike weight over a Florida 50k might save what? 30 seconds? Less?
As has been said here and many times previously, if speed is your sole concern, make more power or need less power. The bike itself is a small portion of the equation, so long as it fits.
__________________