Fan shroud

[gundyfan]

I'm putting 1999 350 vortec in my 1972 swb I am keeping the one pulley system that came with it,only changing where the a/c compressor was and adding a non a/c pulley in it's place.I need to know what fan shroud do i use because i keeping the radiator that was made in 72 and it has original fan shoud attached to it,i know the fan shoud won't work because the fan the came with the 1999 vortec motor is like 19 inches so what fan shroud do i go with.I thought reading past post on this some said to use a big block shroud well i ordered on from brothers and that won't fit. so has anyone got any idea's or know what one will work? Thanks