Dutra Dual exhaust help

looking for advise on exhaust set-up with Dutra Duals...I have front & rear castings. Mechanic doing super six set-up on my 68 Dart Slant six 225. Put in a mini starter for clearance...do we need a heat shield also? I want a dual exhaust out the rear instead of single pipe. What's a good "route/set-up? i.e. H style

Only thing I couldn't get was kickdown linkage. Found used Two barrel intake & air cleaner assembly, heads milled & bought a new 2-bbl carb.