+1 Hmotorsonline is a great place to order from.

as far as your questions go, it all depends on what chassis you use, for what parts you need.

say if you got an EF, you would have to most likely convert the wiring from dual point to multi point. you would also need swap mounts, shift linkage for an EF with a B-series, you would either need to have a cable tranny, or buy the hydro conversion which is $$$. (everything is not listed, but gives you an idea what to expect)

if you go with a DA shell, then the cable tranny, stock mounts,stock shift linkage, only wiring needed is for vtec. unless you have a 90-91 you want to convert to OBD-1, as they come NON OBD. the 92-93 DA's however are already OBD-1

EG's and EK's are almost a direct bolt in... but i personally have never done one so i couldnt give you any insight as what you need to do....