If you don't, and have some cooling issues under extreme conditions of heat and or hill climbing maybe this is the answer.
Can't find it in my parts call up so, 'belly pan' will have to do. It's roughly triangle shape and fits with 4 bolts between the two tension rods and the back of the engine cross member. Has a hole (mine does) so you can get at the rad petcock but covers under the oil pump, alternator and crank pulley and distributor. It's always in the way, or when it's in the way, it gets taken off and then as it doesn't seem to do much it often is not put back on.
I haven had one on forever and the car ran well temperature wise with the clutch fan whirring away. Running full throttle for 10 min up a mountain in 3rd or 4th the gauge would go up a couple of needle widths. I notice that with electric fans (come on at about 2/3) that it will climb to 3/4 and threatens more on long climbs because the low speed doesn't push near enough air through the rad. Was climbing a pass in the Kootenays last summer with a strong tail wind and the temp gauge was near the top of the run range. I had to pull over and let the fans catch up. On cruise, level roads, it's consistently higher than the clutch fan but well below the fans coming on. So I take a good look at how I can force more air through the rad, I've already removed the air con condenser, and sealed around the rad, and the rubber apron on the under side of the hood that closes down on the rad support is there. So what's to stop the air just going under the rad and up behind it? Not much but maybe the belly pan would. I should imagine it keeps road splash off alternator, pulleys, belts and distributor, but most of all forms a low pressure area behind the rad by denying air up from under the front end.
I found one, (I should have 3) and put it on. Looking forward to seeing if it has the effect I want.