I believe all years slant six exhaust manifolds interchange, as far as mounting to the cylinder head,,,
what about the choke pocket?
will a 87 225 D-150 manifold fit to a 65 dart 225 with regards to the choke pocket?

Remember that's only if you're using an original choke coil pulloff. A lot of people have gone to the electric coil because you can adjust it to pull the choke when you want. With the original coil, it pulls off when the motor gets warm enough and that could be way too long, leading to driveability issues.

Regardless, a small home made bracket could be placed on top of the choke pocket to hold the choke coil.

I have the somewhat earlier manifold where I need a cup inside of the choke pocket to keep exhaust from leaking. I bought the electric choke coil pulloff deal and it bolted right up to it with no problem.