Electric fan in lieu of Flex Fan
Let me suggest that the issue of cooling is a bit broader than choosing a fan, shroud or a radiator- but rather it the combination of components and what needs to be cooled.
In my case I had no problem cooling my "warm" 340 with a puller fan on a stock radiator... then came some more mods and I had to add a second fan on the outside to push... then came a 525HP stroker and 11.5/1 compression and I was unable to get the stock radiator to handle it in the summer with any combos of fans or shrouds. Net answer is I suggest a fan/shroud in one persons set-up may not work well for someone else's set-up.
Attached are pix of what did work - Be Cool radiator with twin electrics...... of course that led to all kinds of charging and electrical mods ...... save that for another post!
Kory