Good write up bud. Wish I had seen it before I satrted, but it saved me in the end.
Ill add a bit for this. Im installing Sard 550cc injectors atm, for anyone who is confused on how to get the collars on properly, you need to remove the upper O-ring, slide the collar all the way up, then replace the Sard O-ring with the original (preferably new one) so as it seals the bucket at the top. You will also need to remove the rubber piece that is inside the "hat" so as it will bolt all the way down. Also, make sure you lube the seals with Vasoline, do not use oil as the seals will degrade from it. You will know if you pinch a seal from no lube, it will piss fuel all over the place.
Also I had to use a impact wrench to get mine out, it was a last resort and even then, it was still rounding the screws to a degree, so for anyone having trouble doing it, prepare to get some replacements. Sard supply replacement hex items which are so much easier.