Re: EB I not starting when hot.
docbrown, CFI injectors do cost a decent amount of $$$,
I would recommend picking up a second hand t/body, as you should be able to get one for next to nothing, and see if the problem still persists.
Another thing might be to see if it makes any difference in bringing the key back slightly when starting, as the barrel wears, sometimes when fully in the start position, the contacts go past the "on" position, and you lose power to the ecu and fuel pump.
Although its not really common on falcons, it does happen from time to time.
When the car has been sitting for 1/2 hour or so, and you turn the key to on only, can you hear the fuel pump prime for a second or two?
To tell if the spark is any good, get an old plug and open the gap up to around 1.2-1.4 mm and connect it to the longest lead (no 6.)
Start the car, and you should see a bright blue sharp spark, if it is orange, it may be too weak.