I replaced my small block with a big block now the shroud I have doesn't fit. I have a 17" fan so which big block shroud do I use in my 69?

When I swapped out the 350 for the 454, I used the 350 fan and shroud, of course the fan was up alittle too far into the shroud but it worked. I then switched to the AFCO aluminum radiator and havent used a shroud since, and the 505 doesnt overheat.