manifolds or headers

i have finally come to a point of rebuilding my car. Looking for opinions on build / advice i'm building my 340 not looking for a race car just fun cruiser im running 323 gears and 4 speed valiant. I never have had an exhaust fit worth a darn. The headers I have fit but royal pain in the butt to get in. question is I have stock manifolds but the driver side fits like crap the pipe dumps right into everything z bar torson bar ect.. Do the tti pipes fit around stuff ok or accurate or ???? should i just sell the old manifolds and buy headers i seem the manifolds sell for small fortune...2863553 2863549 Any pictures would be great