Hi Atchi,
Looking at the castings it looks great, but you have reminded me, we need to find the aluminum pickling/cleaning solution, maybe someone on this board knows how to clean aluminum. I saw in a Mini magazine somebody restoring an SU carb. They dipped it into a bath of some solution, left it for a little time, then it came out of the bath sparkling clean. You could have put it on the top of a Christmas tree!
Alan