commando's vs. eddie rpm's

Mike,
They would be too large also as they are listed in the Mopar Performance book as 177 cc's and with 1.92 intake valves, and that they flow 222 cfms. IMO these are larger than the eddies and equal to the small port commandos, the problem with these is the fact that you'll have to use all the magnum rocker gear, and intake manifold. You'll also have to change the lifters to have oil thru so the rockers will be oiled.
All the heads in the MP book are too large for use on a street type 318, or mild bracket race type engine. This is why I said that the 302 heads would be best, then a alternative would be the stock 340-360 1.88 valve heads, but it's just as I stated before that the heads are larger than the 318 engine will be able to use, and port velocity will be weaker and the engine will be down on power some, 30-40 HP.
We generally use a small port high velocity head on a 360's with large type race cams as the cam kills the amount of suction that the engine will be able to pull (loss of engine vacuum and signal due to duration of the cam and centerlines) and the heads help to make the cam work better, and create more signal from the cylinders, due to the small size of the intake runner. It's kind of like a small super charging effect. The 302 heads are good to about 375 RWHP when done properly and cammed correctly.