I bought a used 2004 Wilier Pro Race Scandium frame on ebay, that I plan to build up and use as a crit bike. I'm not sure what the correct headset and bottom bracket would be. See attached images, hopefully this will be of help.

1. The underside of the bottom bracket is stamped:

M
S W
0170
BT
05 04

I'm guessing the 'M' refers to the size medium, the 'BT' would be British Thread and the '05 04' would be the manufacture date? Assuming it is British Thread, would a 2012 British Thread Campagnolo Athena bottom bracket work?

2. I don't have much info to help with the headset, the fork is marked Mizuno MM34 1-1/8". I'm assuming the 1-1/8" is the steerer column diameter, but I have no clue what kind of headset I will need. Can anybody help?