Fan clutch to radiator core distance?

Using the parts avail at the time,, my son's ended up less than a 1/4 in. away,, so we rigged a chain from the bellhousing to the trans cross-member,, so the fan can't contact the rad, if the car comes to an abrupt halt for some reason..

He's gone thru 2 summers without a shroud, never got near hot, stock copper rad.. if it helps..