Those who have done them ... what all comes off the front of the motor.

Do you have to remove the A/C conpressor bracket? What about the P/S pump bracket?

 

http://www.ls1howto.com/index.php?article=23

it's on a f-body but other than the radiator part the swap is identical on out trucks

 

Just pull the intake tube, clutch fan and shroud, belt, then water pump (6 bolts), crank pulley, and front cover. If you have help, get someone to hold up the radiator out of the way during the swap part. Ac condenser and compressor stay in place.