my 81 project, what do i need?

ok i have a 99 ecm and harness out of a camaro 6spd car. and a 6.0 out of a 2004-2007 classic truck. im going to use a 700r4 tranny. what do i need to do to the harness and computer and what do i need to do for fuel pump and fuel lines. and do i need anything for the motor to fit the tranny right? also as far as the ignition goes, how does that work since it computer ran and its currently not right now? and how do u get the a/c to work? links to websites, part numbers would be appreciated. and other info like o2 sensors and what not. thanks.

I was wondering what headers will fit. Not trying to hijack the thread but I figured we need the same info mine as well keep it on one page.