TTI Headers on a 340 in a 65 Dart

I managed to fit a 74 valiant 360 drivers side manifold in my 66, it has the larger ports to match your 340. The only requirements for it was i had to replace the sheisty pot-coupler with a stainless u-joint style coupler from sweet manufacturing, and cut down the steering shaft about 2 inches + machine the double-d style end. 3/4" double D shaft to 36 spline 3/4" shaft, more commonly sold under "vega" steering box couplers if i recall......