commando's vs. eddie rpm's

Stroker Mike,
My .02 is that the eddies and the small port commandos will be too large for the 318 CI engine. The eddies are 168 cc's and the small port commandos are 175 or so cc's OOTB, both of which are too big for the small engine. A 318 can't use more than 150 cc's max and flow 245 cfm's with a 1.88 intake valve, which this is a stock 360 head unported but they won't flow this well in stock form so the port volume go's up and becomes a hinderence, loss of velocity. A good 318 needs and can use a 302 head fully ported which should end up at 136 cc's and flow 230+ cfm's with a 1.78 intake valve. This type of head will make more power than the larger heads and you'll have more fun with the car. These heads will be more efficient than the eddies or the commandos for the 318 CI engine.
Now if your going to make a 349 style engine then the need for better heads becomes greater but still not as large as the eddies or the commandos.
My 404 CI Big Block needs 196 CC's of port volume but I run 184 CC's of port volume, why you may ask. Well the port velocity is better at 184 than it would be at 196, so I opted for the lesser heads and the engine runs 1.46 60 ft. times and 7.05 @ 102 mph at 2865 lbs. 1/8 mi.
The gain was .1 in 60 ft. and .3 in et over a large ported head, and the mph went up 4 mph.
Hope I'm not confuseing you but clairifing things a bit. Bigger isn't always better and being conservative in cylinder heads and having the right cc head for the engine without being too large is best.
Things that most do is over head and over carb. and over cam a engine. But as I said this is just my .02 worth.