<<Since day one (three years ago) my 360 has exhibited a noticeable odor of
fuel
on takeoff.>>

You might want to check the intake manifold drain line.  With a cold engine
fuel can lay in the bottom of the manifold.  When you go to full throttle
the manifold pressure will rise high enough to allow the fuel to run out the
bottom through the drain.  The hose could be disconnected or the drain line
could discharge in a position that swirls the fuel up into the cabin
somehow.  BTDT.

Gary Casey