Seriously, that site has EVERYTHING you need.

But just a rough idea...
Change over your transmission to manual, first off.

Since you've got a B-series...any B-series engine will work.
IE:
B16a1, B16A, B16B, B17, B18A, B18B, B18C, B20A, B20B, B18LSVTEC, B20CRVTEC.

With Honda...your options are near limitless. Or you could just build the B18 you've got.