Runner Lengths

[Wes Branchflower]

Hello everyone, this is my first message here.
I have a problem.
I'm making a MPI system for my Chrysler 265cu (4.3l) inline six hemi motor. 
I'm going to be using Ford 4.0litre injectors, and two XF falcon throttle 
bodies (70mm diameter).

I have two manifold idea's in mind. The first is, (the ascii drawing below) 
a straight pipe (90mm) with 6 smaller (50mm) diameter pipes going to each 
inlet port. The two 70mm Throttle bodies will be mounted on a flange on the 
70mm pipe, equally spaced apart.


|| || || || || ||
|| || || || || ||
|-----------------|
|  XX      XX     |  XX = Throttle body.
|-----------------|


OR
    _______        _______
a  (   XX  )======(  XX   )
   / /| |\ \      / /| |\ \
  / / | | \ \    / / | | \ \
/ /  | |  \ \  / /  | |  \ \

XX = throttle body.
===== - balance tube



I have a few questions:

1. Is there any difference between square intake runners and round?
2. One the 'first' manifold, would it be better to mount the two throttle 
bodies next to each other, or on either ends of the manifold, or equally 
spaced?
3. How long should the intake runners be? what are the 
advantages/disadvantages?

should i use MAP or MAF?

Thankyou all very much for you time and help.

Cya!


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