Electric or Flex Fan?

If your radiator is not in the greatest shape, it will be a really good idea to get it professionally boiled and rodded and repaired first.

Most my cooling issues were mainly from a clogged or poor condition radiator.
I have ran a number of 455 olds cars with no shroud but had good clutch fan and a really clean radiator. Still, the shroud is an excellent addition to a fan for sure and can help a good amount.