which fan shroud?

[gmc 2500 4x4]

ran into a small problem with my 402 install in my 69 gmc 4x4. neither shroud seem to fit. i have a bb 2wd shroud and the 350 4x4 shroud that was in it. i set the motor in the factory spot. 350 mounts, the 4x4 shroud hits bottom pulley, and the factory clutch fan rubs lower shroud. before i chop up this shroud to fit is there another shroud out there that would fit? or smaller fan? i dont want to run electric fan. i know a few have done this swap . and i have the original harrison 4 core 4 spd rad that i need redone. any good shops? any help on this matter would be cool. paul