simple analog fuel injection

[John Wickerham]

A while back, Peter Wales and some others were discussing a simple
analog fuel injection system using a MAF from a Mitsibishi vehicle
along with a 555 timer as a one shot..  I believe the name of the
thread was EFI555.

I am interested in using this system in a couple of applications
and since every attempt to contact Peter Wales directly has failed,
I am resorting to asking the group.  My questions are:

1.  What other hardware is necessary to outfit a typical carbureted
chevy 350 engine?  I know you need the MAF and the 555 with associated
cap's and resitors and such.  And certainly, I need to get TBI throttle
body or something similar off of a late model chevy pickup truck.  Also
need a decent fuel pump.

2.  Would a thermister submersed in the engine coolant work as a secondary
control over the pulse width from the 555 to give decent cold starts?

3.  I have an S10 Blazer that I'd like to run some experiments on
that require shorter pulse widths.  I have been unable to get the computer
to cooperate much in leaning out the mixture.  I have tried biasing the O2
sensor so that it appears to the computer that the engine is running rich,
but this only made it increase EGR flow.

I had an idea that I may be able to use the signal to the injectors that
the comuter is already sending.  I would use this to trigger a pulse from
a 555 that I could custom tailor to fire the injectors instead of the stock
computer.

I am new on the list and would appreciate any comments that anyone might
have.  I've spent much time pouring over stuff on the web, so I've pretty
much exhausted the obvious sources of information.  I am trying to keep
this pretty cheap and learn something at the same time, so I'm not really
considering any of the aftermarket ECU's unless they are awfully cheap.

Thanks
John Wickerham