The engine and trans are about the only things you would be able to use without major modifications. The rearend is specific to the M vans, and has the center section offset almost 1/3 of the way to the right of the axle centerline. The engine is also offset the same amount to clear the steering shaft. The front suspension (depending on 4x2 or awd model) has more in common with the S/T trucks than the C/K. The steering linkage is unique to the M van, with 2 idler arms plus a drag link from the steering box to the center link. This system is very prone to severe wear in the idler arms. These vans are also unit-body, there is no separate frame under them, only a front sub frame similar to a Camaro.
