It will be slow as balls with a 5-speed. These engines only rev to 5000, and do not work out at all well with a stick. They need an automatic so you can spool off the line.
myself and a few others have done the Fbody swap, and DO NOT think a 5-speed is practical, not only for performance but a T5 is ****, won't last unless you build the piss out of it, but you'll end up slowing down anyway..