Stock 318 exhaust reccomendations

I just hang up, because I'm facing the same problems...

I ordered these headers...

http://www.summitracing.com/parts/sum-g9040/overview/make/dodge/year/1974/model/dart

Now, I'm waiting that my car comes out of the paint shop, and my mechanic told me it could be a problem, because often they have problems that the headers come too close to the powersteering.

Anybody that took this headers? Some experiences with this parts?