Hi i have an A6 with an AWT engine. The engine is a write off and i need to replace it. What engines am i able to replace it with?? the awt is relitivly rare to find compared to others so would like an alternitive option, i know there are big and small port engines but are there any differences to the block and head asside from the port sizes and which ones would fit?? i need someone who has done the job or know of it being done, rather than i think this would work etc...... i have looked on elsa and there are a couple that have the same spec but i cant physicaly see any differences!!!! help please!!