engine swap question

I recently swaped a 77 buick 350 into my 71 nova, i never had an exhaust system on the car and i am having problems finding parts, i can't find a exhaust header system that will fit with my stearing box. its located behind the cross beam on drivers side. i also am unsure if a stock or aftermarket exhaust system would fit up to the exhaust manifolds of the buick. any help or links would definatly be great.

steve