I'm pretty sure that you will need to upgrade to the 86/87 ECM if you are going to go with the LT1 and Translator. You can upgrade to the 86/87 coil pack by just getting the adapter at Casper's, no ECM upgrade necessary.
By the way, I did the whole LT1 MAF, Coil pack, ECM, electric fan and MAT sensor upgrade at the same time. It was a lot easier than I thought it would be and the car runs better. Not sure how, but it seems to be less moody. Yea, I know, sounds crazy....