318 intake manifold problems

I have a 1991 d150 ram. I bought a 318 LA crate motor. When we started swapping parts over to put the motor in a lot of stuff didn't fit. Did a little bit of research and supposedly the motor that was taken out was a magnum. My question is if it was a magnum motor that was taken out will the Magnum intake manifold work on the LA? The truck will idle fine and you can rev it up, when you put it in gear and start to go it bogs down. Thanks for all the info