I have had a long running love affair with A-100 vans however they are pretty hard to find these days.
as far as I know the suspension is a completely different animal from any car line. the motor mounts and trans mounts will make you scratch your head because they are unique and very odd looking
as far as I know, I have never seen or heard of a factory 4 speed. I have seen my share of 3 on the tree and auto.