Fuel Injection Question

[Joel Wolcott <wolcott_jl@yahoo.com>]

Here is a broad question which i am sure will elicit
more questions from the knowledgeable audience.  My
application is a 4 cylinder with no boost, this just
in case it makes a difference. What are the
differences having the injector as close to the valve
as possible versus having further upstream?  Does
having it upstream help with fuel/air mixture.  Would
it make a difference using individual throttle bodies
versus standard common plenum.

Thanks