would like to get any info on swapping a 86 B2000 engine with a RX-7 13B

Several ways you could do the tranny, you could put the RX-7 bell housing on the B2200 tranny, it wouldn't be as fast but would accelerate like mad. You could keep the RX-7 tranny on it and swap out the tail housing to bolt it up to the stock tranny mount, or you can modify / fabricate a new tranny mount and the transmission tunnel to work with the RX-7 tranny.

As for the rest that is involved the guys on my forum would know more than I do. Dan Atkins has a supercharged rotary in his and another guy has a TII he put in. Shouldn't be any harder than any other non-bolt up engine swap I would think.

Might want to insulate some parts of the engine compartment and cab because the stock body isn't going to handle the heat I don't think.