Which 340/Magnum manifolds will fit 66 dart 4speed

I have a 318 in my 64 dart. Manual Steering and it now has a 3 speed floor shift. I just used magnum manifolds from a late model Dakota. I don't believe I had to do any modifications at all? But it's been about 10 years since I did the swap.
is that 3spd auto or manual? can you see the PN's on the manifolds? got any pics?