I put some older style heads on a tbi block one time. My engine spun a bearing in my truck so I picked up a tbi 350 cheap and put my heads, intake, carb and distributer on it. All I had to do was run an electric fuel pump because the tbi cam did not have the lobe for the mechanical pump.
It was not a vortec motor though.
But I bet you could run early style heads on a vortec block because you can run vortec heads on early style blocks.