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@Tjuice
A picture of the bike would really help...
1) Per my response to your other thread, not convinced you want a 73mm BB. Course, I can't say definitively, but if it is a road frame, I would be fairly certain you need a 68.
2) 49mm chainline means you have loads of options. The cheapest of which might just be to move the chainring from the outside of the spider to the inside (which might be enough to get the chainline bang on as it is).
FWIW, my back wheel / sprocket combo gives me a chainline of barely over 40mm, which means I needed the shortest possible BB (103mm) AND I had to put the chainring on the inside of the spider (I bought Eighthinch cranks / chainring). Lucky my chainstay was crimped (can't remember the proper term), which means I don't have a chainring clearance problem.