I know the YB is low comp but pistons are available for NA builds which bump it up a lot.

I'd run it with a swedish style inlet with a single throttle body, nice exhaust manifold and everything hidden away to neaten it all up.

I know it's an expensive engine to get a lot of power out of NA, but I don't see 180bhp on a 16v 2 litre as being that much work, especialy not with the quality of the YB head, there's room for massive ports on it.