[V] Rhys, I would not give them that if the car is in their hands, lot of smart comments that will only piss them off more. I've never even left my car over night anywhere, no way i'd be leaving it somewhere for 3 - 4 months, also half your $300 rego down the hole.
Id go there mon morning, put it on a tow truck tell them to freak off and take it home dont pay anything. They wouldn't give the slightest about your life, family. You are the one that owns the 25 yo car so if your after reliability go buy something else, they wont buy that story.
Put a weber on it then you can drive it, work on the efi off the car. the time you spent writing the letter you could have solved half the problems yourself.
Not keen on it, theres a million other people that would be able to work on it, ie. a mobile sparky could sort all your wiring out, you'll probably want the dissy set and running before you start playing with the efi anyway which the weber would help.
It even says it is strongly recomended that the car is running, timing etc before you start playing with the efi MS gear.
Its taken them this long to achieve nothing so what's the letter going to do?