a/c and non a/c fan shrouds.. differances

[E.Furgal]

Hello..
I have a small block(for now) truck with a/c
and the mopar jeep electric fan here for that mod..
my fan shroud is a chopped up mess at the bottom.. and flaps in the breeze somewhat.. the local junkyard has a 70-72 truck with 307 non a/c with a good shroud.. what is the differences.. this truck has what looks like the same rad. and had a plow, so I'm betting on 3-4 row..
the shroud itself looks deeper.. (from core support to fan)
can a non a/c shroud be used on an a/c truck..
as I'd rather not mount the jeep fan in a shroud thats only held on with 2 bolts at the top and nothing at the bottom.. thanks..

iirc the junkyard truck is a 71, mines a 71