Exhaust manifold helP!!

I have a 66 cuda put in a 340..... I can tell you straight up there are no manifolds available that will fit AND that you will be happy with. TTI makes headers as does hooker and one other that I cannot remember.... TTI's are about the best but they do require some modifications ( not easy) absolutly forget Harold & spitfires, waste of time and energy..... the pissing thru a cocktail straw is about the best one I have heard so far...... TTI's are around 900 custom built like mine are a bit more but NO mods necessary and they are built to the car....meaning changing plugs and OIL is no biggy
good luck

Yeah, at the time when I was putting a 340 in Dad's 65, I had three choices I was toying with.
Spitfires, 68 340 Hp manifolds ( I had a set) and the 98 Durango magnum manifolds( I had a set).
If you look at picture #20 here, sorry I don't have it saved anywhere else here at work.
It is with the Magnum Durango manifolds, but I ended up choosing the Spitfires, because Harold was easy to do business with at that time. (2007)

I had enough clearance, (no power steering) that I could have installed them, no problem. They were close, but not touching the steering column once I adjusted all the slop out to the outboard side of the car.