ive no idea about things like fueling. i break it someone else mends it. im selling my engine to someone wanting a complete drop in conversion kit for another e30 and i dont want to let it go just now if theres a possiblity that something negative might come back. unfortunately its almost removed from my e30 so i cant run it just now.
all the plugs are the same condition and this is a random pic of the 3 plug from the front, im not sure if it tells you much but it does give an idea of how sooty they are....