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@TheBrick(Tommy)
What was the frame in it's old life? Some mbts struggle with a 42 mm chainline (with large rings).
Did you buy the b.b and crank set to give you a 42 mm chainline or have you just got the crank set and are tring it on the b.b that was on the bike?
Was the crankset new, if so the documentation should tell you what length b.b will give you what ever chainline. You may have to alter the length off b.b you buy to obtain the decired chainline.