1985 P30 SouthWind New motor engine/trans Options

Fixing the current will be the cheapest option and install a new tranny.

If you are going for very long trips accross the nation then get rid of the manifold (cause they will crack again, it's just a time issue) install banks torque tubes only.

For a swap I would have gone with the las generation of the 454 the 7400 vortec with 4L80E. You would have gain a significant amount of how and torque even in standard form.